diff --git a/.babelrc b/.babelrc
index 6f6f27bfe..57750d503 100644
--- a/.babelrc
+++ b/.babelrc
@@ -12,9 +12,7 @@
     "resource/react-dom.js",
     "resource/bluebird.js",
     "resource/bluebird/*.js",
-    "test/resource/httpd.js",
-    "test/resource/mocha.js",
-    "test/resource/co-mocha.js"
+    "test/resource/*.js"
   ],
   "plugins": [
     "syntax-flow",
diff --git a/.gitignore b/.gitignore
index 10114b175..323a4f034 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .DS_Store
 node_modules
-build
\ No newline at end of file
+build
+.signatures.json
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index 99fd43041..5d35d2d0e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -29,7 +29,7 @@ before_script:
     - export DISPLAY=:99.0
     - sh -e /etc/init.d/xvfb start
     - npm i
-    - node_modules/.bin/gulp build
+    - npm run build
     - if [ $FX_VERSION = "54.0b" ] &&
          [ $TRAVIS_REPO_SLUG = "zotero/zotero" ] &&
          [ $TRAVIS_BRANCH = "master" ] &&
diff --git a/gulp/babel-worker.js b/gulp/babel-worker.js
deleted file mode 100644
index d77f01b1f..000000000
--- a/gulp/babel-worker.js
+++ /dev/null
@@ -1,55 +0,0 @@
-/* global onmessage: true, postMessage: false */
-'use strict';
-
-const fs = require('fs');
-const path = require('path');
-const babel = require('babel-core');
-const minimatch = require('minimatch')
-const mkdirp = require('mkdirp');
-const options = JSON.parse(fs.readFileSync('.babelrc'));
-
-/* exported onmessage */
-onmessage = (ev) => {
-	const t1 = Date.now();
-	const sourcefile = path.normalize(ev.data);
-	let error = null;
-	let isSkipped = false;
-
-	fs.readFile(sourcefile, 'utf8', (err, data) => {
-		var transformed;
-		if(sourcefile === 'resource/react-dom.js') {
-			transformed = data.replace(/ownerDocument\.createElement\((.*?)\)/gi, 'ownerDocument.createElementNS(DOMNamespaces.html, $1)');
-		} else if('ignore' in options && options.ignore.some(ignoreGlob => minimatch(sourcefile, ignoreGlob))) {
-			transformed = data;
-			isSkipped = true;
-		} else {
-			try {
-				transformed = babel.transform(data, options).code;
-			} catch(c) {
-				transformed = data;
-				isSkipped = true;
-				error = c.message;
-			}
-		}
-
-		const outfile = path.join('build', sourcefile);
-		error = error || err;
-
-		mkdirp(path.dirname(outfile), err => {
-			error = error || err;
-
-			fs.writeFile(outfile, transformed, err => {
-				error = error || err;
-
-				const t2 = Date.now();
-				postMessage({
-					isSkipped,
-					sourcefile,
-					outfile,
-					error,
-					processingTime: t2 - t1
-				});	
-			});
-		});
-	});	
-};
\ No newline at end of file
diff --git a/gulp/gulp-react-patcher.js b/gulp/gulp-react-patcher.js
deleted file mode 100644
index 26b9b4fbe..000000000
--- a/gulp/gulp-react-patcher.js
+++ /dev/null
@@ -1,34 +0,0 @@
-const path = require('path');
-const gutil = require('gulp-util');
-const through = require('through2');
-const PluginError = gutil.PluginError;
-
-const PLUGIN_NAME = 'gulp-react-patcher';
-
-module.exports = function() {
-	return through.obj(function(file, enc, callback) {
-		if (file.isNull()) {
-			this.push(file);
-			return callback();
-		}
-
-		if(file.isStream()) {
-			this.emit('error', new PluginError(PLUGIN_NAME, 'Streams are not supported!'));
-			return callback();
-		}
-
-		try {
-
-			let filename = path.basename(file.path);
-
-			if(filename === 'react-dom.js') {
-				file.contents = Buffer.from(file.contents.toString().replace(/ownerDocument\.createElement\((.*?)\)/gi, 'ownerDocument.createElementNS(DOMNamespaces.html, $1)'), enc);
-			}
-		} catch(e) {
-			this.emit('error', new PluginError(PLUGIN_NAME, e));
-		}
-
-		this.push(file);
-		callback();
-	});
-};
diff --git a/gulpfile.js b/gulpfile.js
deleted file mode 100644
index db5594a14..000000000
--- a/gulpfile.js
+++ /dev/null
@@ -1,263 +0,0 @@
-'use strict';
-
-const gulp = require('gulp');
-const del = require('del');
-const vfs = require('vinyl-fs');
-const gutil = require('gulp-util');
-const babel = require('gulp-babel');
-const sass = require('gulp-sass');
-const os = require('os');
-const glob = require('glob');
-const Worker = require('tiny-worker');
-const merge = require('merge-stream');
-const tap = require('gulp-tap');
-const rename = require('gulp-rename');
-const browserify = require('browserify');
-const reactPatcher = require('./gulp/gulp-react-patcher');
-const isWindows = /^win/.test(process.platform);
-const NODE_ENV = process.env.NODE_ENV;
-const workers = [];
-var isExiting = false;
-
-const formatDirsforMatcher = dirs => {
-	return dirs.length > 1 ? `{${dirs.join(',')}}` : dirs[0];
-};
-
-const killAllWorkers = () => {
-	for(let worker of workers) {
-		worker.terminate();
-	}
-};
-
-// list of folders from where .js files are compiled and non-js files are symlinked
-const dirs = [
-	'chrome',
-	'components',
-	'defaults',
-	'resource',
-	'resource/web-library',
-	'test',
-	'test/resource/chai',
-	'test/resource/chai-as-promised',
-	'test/resource/mocha'
-];
-
-// list of folders from which all files are symlinked
-const symlinkDirs = [
-	'styles',
-	'translators',
-];
-
-// list of folders which are copied to the build folder
-const copyDirs = [
-	'test/tests/data' // browser follows symlinks when loading test data
-					  // triggering false-positive test results with mismatched URIs
-];
-
-// list of files from root folder to symlink
-const symlinkFiles = [
-	'chrome.manifest', 'install.rdf', 'update.rdf'
-];
-
-// these files will be browserified during the build
-const browserifyConfigs = [
-	{
-		src: 'node_modules/sinon/lib/sinon.js',
-		dest: 'test/resource/sinon.js',
-		config: {
-			standalone: 'sinon'
-		}
-	},
-	{
-		src: 'node_modules/chai-as-promised/lib/chai-as-promised.js',
-		dest: 'test/resource/chai-as-promised.js',
-		config: {
-			standalone: 'chaiAsPromised'
-		}
-	}
-];
-
-const jsGlob = `./\{${dirs.join(',')}\}/**/*.js`;
-const jsGlobIgnore = `./\{${symlinkDirs.concat(copyDirs).join(',')}\}/**/*.js`;
-
-function onError(shouldExit, err) {
-	if(shouldExit) {
-		isExiting = true;
-		killAllWorkers();
-		throw new Error(err);
-	} else {
-		gutil.log(gutil.colors.red('Error:'), err);
-		this.emit('end');
-	}
-}
-
-function onSuccess(msg) {
-	if(!isExiting) {
-		gutil.log(gutil.colors.green('Build:'), msg);
-	}
-}
-
-function getBrowserify(exitOnError = true) {
-	const streams = browserifyConfigs.map(config => {
-		return gulp
-			.src(config.src)
-			.pipe(tap(file => {
-				file.contents = browserify(file.path, config.config).bundle();
-			}))
-			.pipe(rename(config.dest))
-			.on('error', function(err) { onError.bind(this)(exitOnError, err); })
-			.on('data', file => {
-				onSuccess(`[browserify] ${file.path}`);
-			})
-			.pipe(gulp.dest('build'));
-	});
-
-	return merge.apply(merge, streams);
-}
-
-function getJS(source, sourceIgnore, exitOnError = true) {
-	if (sourceIgnore) {
-		source = [source, '!' + sourceIgnore];
-	}
-
-	return gulp.src(source, { base: '.' })
-		.pipe(babel())
-		.on('error', function(err) { onError.bind(this)(exitOnError, err); })
-		.on('data', file => {
-			onSuccess(`[js] ${file.path}`);
-		})
-		.pipe(reactPatcher())
-		.pipe(gulp.dest('./build'));
-}
-
-function getJSParallel(source, sourceIgnore, exitOnError = true) {
-	const jsFiles = glob.sync(source, { ignore: sourceIgnore });
-	const cpuCount = os.cpus().length;
-	const threadCount = Math.min(cpuCount, jsFiles.length);
-	let threadsActive = threadCount;
-	let isError = false;
-
-	return new Promise((resolve, reject) => {
-		for(let i = 0; i < threadCount; i++) {
-			let worker = new Worker('gulp/babel-worker.js');
-			workers[i] = worker;
-			worker.onmessage = ev => {
-				if(ev.data.error) {
-					isError = true;
-					let errorMsg = `Failed while processing ${ev.data.sourcefile}: ${ev.data.error}`;
-					NODE_ENV == 'debug' && console.log(`process ${i}: ${errorMsg}`);
-					onError(exitOnError, errorMsg);
-					reject(errorMsg);
-				}
-
-				NODE_ENV == 'debug' && console.log(`process ${i} took ${ev.data.processingTime} ms to process ${ev.data.sourcefile}`);
-				NODE_ENV != 'debug' && onSuccess(`[js] ${ev.data.sourcefile}`);
-				
-				if(ev.data.isSkipped) {
-					NODE_ENV == 'debug' && console.log(`process ${i} SKIPPED ${ev.data.sourcefile}`);
-				}
-				let nextFile = jsFiles.pop();
-
-				if(!isError && nextFile) {
-					NODE_ENV == 'debug' && console.log(`process ${i} scheduled to process ${nextFile}`);
-					worker.postMessage(nextFile);
-				} else {
-					NODE_ENV == 'debug' && console.log(`process ${i} has terminated`);
-					worker.terminate();
-					workers.splice(i, 1);
-					if(!--threadsActive) {
-						resolve();
-					}
-				}
-			};
-			worker.postMessage(jsFiles.pop());
-		}
-		
-		NODE_ENV == 'debug' && console.log(`Started ${threadCount} processes for processing JS`);
-	});
-}
-
-function getSymlinks(exitOnError = true) {
-	const match = symlinkFiles
-		.concat(dirs.map(d => `${d}/**`))
-		.concat(symlinkDirs.map(d => `${d}/**`))
-		.concat([`!./${formatDirsforMatcher(dirs)}/**/*.js`])
-		.concat([`!./${formatDirsforMatcher(copyDirs)}/**`]);
-
-	return gulp
-		.src(match, { nodir: true, base: '.', read: isWindows })
-		.on('error', function(err) { onError.bind(this)(exitOnError, err); })
-		.on('data', file => {
-			onSuccess(`[ln] ${file.path.substr(__dirname.length + 1)}`);
-		})
-		.pipe(isWindows ? gulp.dest('build/') : vfs.symlink('build/'));
-}
-
-function getCopy(exitOnError = true) {
-	return gulp
-		.src(copyDirs.map(d => `${d}/**`), { base: '.' })
-		.on('data', file => {
-			onSuccess(`[cp] ${file.path.substr(__dirname.length + 1)}`);
-		})
-		.on('error', function(err) { onError.bind(this)(exitOnError, err); })
-		.pipe(gulp.dest('build/'));
-}
-
-function getSass(exitOnError = true) {
-	return gulp
-		.src('scss/*.scss')
-		.on('error', function(err) { onError.bind(this)(exitOnError, err); })
-		.pipe(sass())
-		.pipe(gulp.dest('./build/chrome/skin/default/zotero/components/'));
-}
-
-
-gulp.task('clean', () => {
-	return del('build');
-});
-
-gulp.task('symlink', () => {
-	return getSymlinks();
-});
-
-gulp.task('js', done => {
-	getJSParallel(jsGlob, jsGlobIgnore)
-		.then(done)
-		.catch(errorMsg => {
-			onError(errorMsg);
-		});
-});
-
-gulp.task('browserify', () => {
-	getBrowserify();
-});
-
-gulp.task('copy', () => {
-	getCopy();
-});
-
-gulp.task('sass', () => {
-	return getSass();
-});
-
-gulp.task('build', ['js', 'sass', 'symlink', 'browserify', 'copy']);
-
-gulp.task('build-clean', ['clean'], () => {
-	gulp.start('build');
-});
-
-gulp.task('dev', ['clean'], () => {
-	var interval = 750;
-	
-	gulp.watch(jsGlob, { interval }).on('change', event => {
-		getJS(event.path, jsGlobIgnore, false);
-	});
-
-	gulp.watch('src/styles/*.scss', { interval }).on('change', () => {
-		getSass(false);
-	});
-
-	gulp.start('build');
-});
-
-gulp.task('default', ['dev']);
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 595b335f9..e37059e49 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3,6 +3,12 @@
   "version": "5.0.0",
   "lockfileVersion": 1,
   "dependencies": {
+    "abbrev": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.0.tgz",
+      "integrity": "sha1-0FVMIlZjbi9W58LlrRg/hZQo2B8=",
+      "dev": true
+    },
     "acorn": {
       "version": "4.0.13",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-4.0.13.tgz",
@@ -53,12 +59,6 @@
       "integrity": "sha512-ZpYajIfO0j2cOFTO955KUMIKNmj6zhX8kVztMAxFsDaMwz+9Z9SV0uou2pC9HJqcfpffOsjnbrDMvkNy+9RXPw==",
       "dev": true
     },
-    "archy": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
-      "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=",
-      "dev": true
-    },
     "are-we-there-yet": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.4.tgz",
@@ -209,15 +209,15 @@
       "dev": true
     },
     "babel-core": {
-      "version": "6.24.1",
-      "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.24.1.tgz",
-      "integrity": "sha1-jEKFZNzh4fQfszfsNPTDsCK1rYM=",
+      "version": "6.25.0",
+      "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.25.0.tgz",
+      "integrity": "sha1-fdQrBGPHQunVKW3rPsZ6kyLa1yk=",
       "dev": true
     },
     "babel-generator": {
-      "version": "6.24.1",
-      "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.24.1.tgz",
-      "integrity": "sha1-5xX0hsWN7SVknYiJRNUqoHxdlJc=",
+      "version": "6.25.0",
+      "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.25.0.tgz",
+      "integrity": "sha1-M6GvcNXyiQrrRlpKd5PB32qeqfw=",
       "dev": true
     },
     "babel-helper-builder-react-jsx": {
@@ -329,9 +329,9 @@
       "dev": true
     },
     "babel-plugin-transform-react-display-name": {
-      "version": "6.23.0",
-      "resolved": "https://registry.npmjs.org/babel-plugin-transform-react-display-name/-/babel-plugin-transform-react-display-name-6.23.0.tgz",
-      "integrity": "sha1-Q5iRDDWEQdxM7xh4cmTQQS7Tazc=",
+      "version": "6.25.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-transform-react-display-name/-/babel-plugin-transform-react-display-name-6.25.0.tgz",
+      "integrity": "sha1-Z+K/Hx6ck6sI25Z5LgU5K/LMKNE=",
       "dev": true
     },
     "babel-plugin-transform-react-jsx": {
@@ -399,33 +399,33 @@
       }
     },
     "babel-template": {
-      "version": "6.24.1",
-      "resolved": "https://registry.npmjs.org/babel-template/-/babel-template-6.24.1.tgz",
-      "integrity": "sha1-BK5RTx+Ts6JTfyoPYKWkX7gwgzM=",
+      "version": "6.25.0",
+      "resolved": "https://registry.npmjs.org/babel-template/-/babel-template-6.25.0.tgz",
+      "integrity": "sha1-ZlJBFmt8KqTGGdceGSlpVSsQwHE=",
       "dev": true
     },
     "babel-traverse": {
-      "version": "6.24.1",
-      "resolved": "https://registry.npmjs.org/babel-traverse/-/babel-traverse-6.24.1.tgz",
-      "integrity": "sha1-qzZnP9NW+aCUhlnnszjV/q2zFpU=",
+      "version": "6.25.0",
+      "resolved": "https://registry.npmjs.org/babel-traverse/-/babel-traverse-6.25.0.tgz",
+      "integrity": "sha1-IldJfi/NGbie3BPEyROB+VEklvE=",
       "dev": true
     },
     "babel-types": {
-      "version": "6.24.1",
-      "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.24.1.tgz",
-      "integrity": "sha1-oTaHncFbNga9oNkMH8dDBML/CXU=",
+      "version": "6.25.0",
+      "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.25.0.tgz",
+      "integrity": "sha1-cK+ySNVmDl0Y+BHZHIMDtUE0oY4=",
       "dev": true
     },
     "babylon": {
-      "version": "6.17.2",
-      "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.17.2.tgz",
-      "integrity": "sha1-IB0l71+JLEG65JSIsI2w3Udun1w=",
+      "version": "6.17.4",
+      "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.17.4.tgz",
+      "integrity": "sha512-kChlV+0SXkjE0vUn9OZ7pBMWRFd8uq3mZe8x1K6jhuNcAFAtEnjchFAqB+dYEXKyd+JpT6eppRR78QAr5gTsUw==",
       "dev": true
     },
     "balanced-match": {
-      "version": "0.4.2",
-      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-0.4.2.tgz",
-      "integrity": "sha1-yz8+PHMtwPAe5wtAPzAuYddwmDg=",
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
     "base64-js": {
@@ -441,22 +441,22 @@
       "dev": true,
       "optional": true
     },
-    "beeper": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/beeper/-/beeper-1.1.1.tgz",
-      "integrity": "sha1-5tXqjF2tABMEpwsiY4RH9pyy+Ak=",
-      "dev": true
-    },
     "binary-extensions": {
       "version": "1.8.0",
       "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.8.0.tgz",
       "integrity": "sha1-SOyNFt9Dd+rl+liEaCSAr02Vx3Q=",
       "dev": true
     },
+    "block-stream": {
+      "version": "0.0.9",
+      "resolved": "https://registry.npmjs.org/block-stream/-/block-stream-0.0.9.tgz",
+      "integrity": "sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=",
+      "dev": true
+    },
     "bluebird": {
-      "version": "3.4.7",
-      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.4.7.tgz",
-      "integrity": "sha1-9y12C+Cbf3bQjtj66Ysomo0F+rM="
+      "version": "3.5.0",
+      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.0.tgz",
+      "integrity": "sha1-eRQg1/VR7qKJdFOop3ZT+WYG1nw="
     },
     "bn.js": {
       "version": "4.11.6",
@@ -476,9 +476,9 @@
       "integrity": "sha1-ZZbHq0D2Y3OTMjqwvIDQZPxjBJg="
     },
     "brace-expansion": {
-      "version": "1.1.7",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.7.tgz",
-      "integrity": "sha1-Pv/DxQ4ABTH7cg6v+A8K6O8jz1k=",
+      "version": "1.1.8",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.8.tgz",
+      "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI=",
       "dev": true
     },
     "braces": {
@@ -651,18 +651,6 @@
       "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
       "dev": true
     },
-    "clone": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/clone/-/clone-1.0.2.tgz",
-      "integrity": "sha1-Jgt6meux7f4kdTgXX3gyQ8sZ0Uk=",
-      "dev": true
-    },
-    "clone-stats": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/clone-stats/-/clone-stats-0.0.1.tgz",
-      "integrity": "sha1-uI+UqCzzi4eR1YBG6kAprYjKmdE=",
-      "dev": true
-    },
     "co": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
@@ -681,6 +669,12 @@
       "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
       "dev": true
     },
+    "colors": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/colors/-/colors-1.1.2.tgz",
+      "integrity": "sha1-FopHAXVran9RoSzgyXv6KMCE7WM=",
+      "dev": true
+    },
     "combine-source-map": {
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-    "unique-stream": {
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-      "resolved": "https://registry.npmjs.org/unique-stream/-/unique-stream-1.0.0.tgz",
-      "integrity": "sha1-1ZpKdUJ0R9mqbJHnAmP40mpLEEs=",
+    "universalify": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.0.tgz",
+      "integrity": "sha1-nrHEZR3rzGcMyU8adXYjMruWd3g=",
       "dev": true
     },
     "url": {
@@ -4244,12 +3451,6 @@
         }
       }
     },
-    "user-home": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/user-home/-/user-home-1.1.1.tgz",
-      "integrity": "sha1-K1viOjK2Onyd640PKNSFcko98ZA=",
-      "dev": true
-    },
     "util": {
       "version": "0.10.3",
       "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
@@ -4271,21 +3472,9 @@
       "dev": true
     },
     "uuid": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.0.1.tgz",
-      "integrity": "sha1-ZUS7ot/ajBzxfmKaOjBeK7H+5sE=",
-      "dev": true
-    },
-    "v8flags": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-2.1.1.tgz",
-      "integrity": "sha1-qrGh+jDUX4jdMhFIh1rALAtV5bQ=",
-      "dev": true
-    },
-    "vali-date": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/vali-date/-/vali-date-1.0.0.tgz",
-      "integrity": "sha1-G5BKWWCfsyjvB4E4Qgk09rhnCaY=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.1.0.tgz",
+      "integrity": "sha512-DIWtzUkw04M4k3bf1IcpS2tngXEL26YUD2M0tMDUpnUrz2hgzUBlD55a4FjdLGPvfHxS6uluGWvaVEqgBcVa+g==",
       "dev": true
     },
     "validate-npm-package-license": {
@@ -4300,118 +3489,6 @@
       "integrity": "sha1-z/XfEpRtKX0rqu+qJoniW+AcAFw=",
       "dev": true
     },
-    "vinyl": {
-      "version": "0.5.3",
-      "resolved": "https://registry.npmjs.org/vinyl/-/vinyl-0.5.3.tgz",
-      "integrity": "sha1-sEVbOPxeDPMNQyUTLkYZcMIJHN4=",
-      "dev": true
-    },
-    "vinyl-fs": {
-      "version": "2.4.4",
-      "resolved": "https://registry.npmjs.org/vinyl-fs/-/vinyl-fs-2.4.4.tgz",
-      "integrity": "sha1-vm/zJwy1Xf19MGNkDegfJddTIjk=",
-      "dev": true,
-      "dependencies": {
-        "glob": {
-          "version": "5.0.15",
-          "resolved": "https://registry.npmjs.org/glob/-/glob-5.0.15.tgz",
-          "integrity": "sha1-G8k2ueAvSmA/zCIuz3Yz0wuLk7E=",
-          "dev": true
-        },
-        "glob-parent": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-3.1.0.tgz",
-          "integrity": "sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=",
-          "dev": true
-        },
-        "glob-stream": {
-          "version": "5.3.5",
-          "resolved": "https://registry.npmjs.org/glob-stream/-/glob-stream-5.3.5.tgz",
-          "integrity": "sha1-pVZlqajM3EGRWofHAeMtTgFvrSI=",
-          "dev": true,
-          "dependencies": {
-            "readable-stream": {
-              "version": "1.0.34",
-              "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz",
-              "integrity": "sha1-Elgg40vIQtLyqq+v5MKRbuMsFXw=",
-              "dev": true
-            },
-            "through2": {
-              "version": "0.6.5",
-              "resolved": "https://registry.npmjs.org/through2/-/through2-0.6.5.tgz",
-              "integrity": "sha1-QaucZ7KdVyCQcUEOHXp6lozTrUg=",
-              "dev": true
-            }
-          }
-        },
-        "graceful-fs": {
-          "version": "4.1.11",
-          "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.11.tgz",
-          "integrity": "sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg=",
-          "dev": true
-        },
-        "is-extglob": {
-          "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-2.1.1.tgz",
-          "integrity": "sha1-qIwCU1eR8C7TfHahueqXc8gz+MI=",
-          "dev": true
-        },
-        "is-glob": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-3.1.0.tgz",
-          "integrity": "sha1-e6WuJCF4BKxwcHuWkiVnSGzD6Eo=",
-          "dev": true
-        },
-        "isarray": {
-          "version": "0.0.1",
-          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
-          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8=",
-          "dev": true
-        },
-        "json-stable-stringify": {
-          "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/json-stable-stringify/-/json-stable-stringify-1.0.1.tgz",
-          "integrity": "sha1-mnWdOcXy/1A/1TAGRu1EX4jE+a8=",
-          "dev": true
-        },
-        "ordered-read-streams": {
-          "version": "0.3.0",
-          "resolved": "https://registry.npmjs.org/ordered-read-streams/-/ordered-read-streams-0.3.0.tgz",
-          "integrity": "sha1-cTfmmzKYuzQiR6G77jiByA4v14s=",
-          "dev": true
-        },
-        "string_decoder": {
-          "version": "0.10.31",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
-          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
-          "dev": true
-        },
-        "strip-bom": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-2.0.0.tgz",
-          "integrity": "sha1-YhmoVhZSBJHzV4i9vxRHqZx+aw4=",
-          "dev": true
-        },
-        "unique-stream": {
-          "version": "2.2.1",
-          "resolved": "https://registry.npmjs.org/unique-stream/-/unique-stream-2.2.1.tgz",
-          "integrity": "sha1-WqADz76Uxf+GbE59ZouxxNuts2k=",
-          "dev": true
-        },
-        "vinyl": {
-          "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/vinyl/-/vinyl-1.2.0.tgz",
-          "integrity": "sha1-XIgDbPVl5d8FVYv8kR+GVt8hiIQ=",
-          "dev": true
-        }
-      }
-    },
-    "vinyl-sourcemaps-apply": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/vinyl-sourcemaps-apply/-/vinyl-sourcemaps-apply-0.2.1.tgz",
-      "integrity": "sha1-q2VJ1h0XLCsbh75cUI0jnI74dwU=",
-      "dev": true
-    },
     "vm-browserify": {
       "version": "0.0.4",
       "resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-0.0.4.tgz",
@@ -4428,12 +3505,6 @@
       "resolved": "https://registry.npmjs.org/warning/-/warning-2.1.0.tgz",
       "integrity": "sha1-ISINnGOvx3qMkhEeARr3Bc4MaQE="
     },
-    "watchify": {
-      "version": "3.9.0",
-      "resolved": "https://registry.npmjs.org/watchify/-/watchify-3.9.0.tgz",
-      "integrity": "sha1-8HX9LoqGrN6Eztum5cKgvt1SPZ4=",
-      "dev": true
-    },
     "whatwg-fetch": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.3.tgz",
diff --git a/package.json b/package.json
index 65f78bd0d..3e13c7aa3 100644
--- a/package.json
+++ b/package.json
@@ -5,10 +5,13 @@
   "description": "Zotero",
   "main": "",
   "scripts": {
-    "start": "./node_modules/.bin/gulp",
-    "build": "./node_modules/.bin/gulp build-clean",
-    "sass": "./node_modules/.bin/gulp sass",
-    "clean": "./node_modules/.bin/gulp clean"
+    "start": "node ./scripts/build.js && node ./scripts/watch.js",
+    "build": "node ./scripts/build.js",
+    "sass": "node ./scripts/sass.js",
+    "js": "node ./scripts/js.js",
+    "clean": "node ./scripts/clean.js",
+    "clean-build": "node ./scripts/clean.js && node ./scripts/build.js",
+    "clean-start": "node ./scripts/clean.js && node ./scripts/build.js && node ./scripts/watch.js"
   },
   "license": "",
   "dependencies": {
@@ -33,22 +36,16 @@
     "browserify": "^14.3.0",
     "chai": "^3.5.0",
     "chai-as-promised": "^6.0.0",
+    "chokidar": "^1.7.0",
     "co-mocha": "^1.2.0",
-    "del": "^2.2.2",
-    "glob": "^7.1.2",
-    "gulp": "^3.9.1",
-    "gulp-babel": "^6.1.2",
-    "gulp-rename": "^1.2.2",
-    "gulp-sass": "^3.1.0",
-    "gulp-tap": "^1.0.1",
-    "gulp-util": "^3.0.7",
-    "merge-stream": "^1.0.1",
-    "minimatch": "^3.0.4",
+    "colors": "^1.1.2",
+    "eslint-plugin-react": "^7.1.0",
+    "fs-extra": "^3.0.1",
+    "globby": "^6.1.0",
     "mocha": "^3.4.2",
+    "multimatch": "^2.1.0",
+    "node-sass": "^4.5.3",
     "sinon": "^2.3.1",
-    "through2": "^2.0.1",
-    "tiny-worker": "^2.1.1",
-    "vinyl-fs": "^2.4.4",
-    "watchify": "^3.7.0"
+    "universalify": "^0.1.0"
   }
 }
diff --git a/scripts/babel-worker.js b/scripts/babel-worker.js
new file mode 100644
index 000000000..19754ffb9
--- /dev/null
+++ b/scripts/babel-worker.js
@@ -0,0 +1,56 @@
+/* global onmessage: true, postMessage: false */
+'use strict';
+
+const fs = require('fs-extra');
+const path = require('path');
+const babel = require('babel-core');
+const multimatch = require('multimatch');
+const options = JSON.parse(fs.readFileSync('.babelrc'));
+const cluster = require('cluster');
+
+/* exported onmessage */
+async function babelWorker(ev) {
+	const t1 = Date.now();
+	const sourcefile = ev.file;
+	const outfile = path.join('build', sourcefile);
+	const postError = (error) => {
+		process.send({
+			sourcefile,
+			outfile,
+			error
+		});
+	};
+
+	var isSkipped = false;
+	var transformed;
+
+	try {
+		let contents = await fs.readFile(sourcefile, 'utf8');
+		if (sourcefile === 'resource/react-dom.js') {
+			// patch react
+			transformed = contents.replace(/ownerDocument\.createElement\((.*?)\)/gi, 'ownerDocument.createElementNS(DOMNamespaces.html, $1)');
+		} else if ('ignore' in options && options.ignore.some(ignoreGlob => multimatch(sourcefile, ignoreGlob).length)) {
+			transformed = contents;
+			isSkipped = true;
+		} else {
+			try {
+				transformed = babel.transform(contents, options).code;
+			} catch (error) { return postError(`Babel error: ${error}`);}
+		}
+
+		await fs.outputFile(outfile, transformed);
+		const t2 = Date.now();
+		process.send({
+			isSkipped,
+			sourcefile,
+			outfile,
+			processingTime: t2 - t1
+		});
+	} catch (error) { return postError(`I/O error: ${error}`); }
+}
+
+module.exports = babelWorker;
+
+if (cluster.isWorker) {
+	process.on('message', babelWorker);
+}
\ No newline at end of file
diff --git a/scripts/browserify.js b/scripts/browserify.js
new file mode 100644
index 000000000..9328e36d8
--- /dev/null
+++ b/scripts/browserify.js
@@ -0,0 +1,78 @@
+'use strict';
+
+const browserify = require('browserify');
+const globby = require('globby');
+const path = require('path');
+const fs = require('fs-extra');
+const { getSignatures, writeSignatures, cleanUp, compareSignatures, getFileSignature, onSuccess, onError, onProgress } = require('./utils');
+
+const { browserifyConfigs } = require('./config');
+const ROOT = path.resolve(__dirname, '..');
+
+async function getBrowserify(signatures) {
+	const t1 = Date.now();
+	var count = 0;
+	var config, f, totalCount;
+	
+	while ((config = browserifyConfigs.pop()) != null) {
+		let files = await globby(config.src, { cwd: ROOT });
+		totalCount += files.length;
+		
+		while ((f = files.pop()) != null) {
+			let newFileSignature = await getFileSignature(f);
+			const dest = path.join('build', config.dest);
+			
+			if (f in signatures) {
+				if (compareSignatures(newFileSignature, signatures[f])) {
+					try {
+						await fs.access(dest, fs.constants.F_OK);
+						continue;
+					} catch (_) {
+						// file does not exists in build, fallback to browserifing
+					}
+				}
+			}
+			try {
+				await fs.mkdirp(path.dirname(dest));
+				const bundleFs = fs.createWriteStream(dest);
+				await new Promise((resolve, reject) => {
+					bundleFs
+					.on('error', reject)
+					.on('finish', resolve);
+					browserify(f, config.config).bundle().pipe(bundleFs);
+				});
+
+				onProgress(f, dest, 'browserify');
+				signatures[f] = newFileSignature;
+				count++;
+			} catch (err) {
+				throw new Error(`Failed on ${f}: ${err}`);
+			}
+		}
+	}
+
+	const t2 = Date.now();
+	return {
+		action: 'browserify',
+		count,
+		totalCount,
+		processingTime: t2 - t1
+	};
+}
+
+module.exports = getBrowserify;
+
+if (require.main === module) {
+	(async () => {
+		try {
+			const signatures = await getSignatures();
+			onSuccess(await getBrowserify(signatures));
+			onSuccess(await cleanUp(signatures));
+			await writeSignatures(signatures);
+		} catch (err) {
+			process.exitCode = 1;
+			global.isError = true;
+			onError(err);
+		}
+	})();
+}
\ No newline at end of file
diff --git a/scripts/build.js b/scripts/build.js
new file mode 100644
index 000000000..0386ac08d
--- /dev/null
+++ b/scripts/build.js
@@ -0,0 +1,44 @@
+const colors = require('colors/safe');
+
+const getBrowserify = require('./browserify');
+const getCopy = require('./copy');
+const getJS = require('./js');
+const getSass = require('./sass');
+const getSymlinks = require('./symlinks');
+const { formatDirsForMatcher, getSignatures, writeSignatures, cleanUp, onSuccess, onError} = require('./utils');
+const { dirs, symlinkDirs, copyDirs, symlinkFiles, jsFiles, ignoreMask } = require('./config');
+
+if (require.main === module) {
+	(async () => {
+		try {
+			const t1 = Date.now();
+			global.isError = false; // used to prevent further output to avoid concealing errors
+			const symlinks = symlinkFiles
+				.concat(dirs.map(d => `${d}/**`))
+				.concat([`!${formatDirsForMatcher(dirs)}/**/*.js`])
+				.concat([`!${formatDirsForMatcher(copyDirs)}/**`])
+
+			const signatures = await getSignatures();
+			const results = await Promise.all([
+				getBrowserify(signatures),
+				getCopy(copyDirs.map(d => `${d}/**`), { ignore: ignoreMask }, signatures),
+				getJS(jsFiles, { ignore: ignoreMask }, signatures),
+				getSass('scss/*.scss', { root: 'scss', ignore: ignoreMask }, signatures),
+				getSymlinks(symlinks, { nodir: true, ignore: ignoreMask }, signatures),
+				getSymlinks(symlinkDirs, { ignore: ignoreMask }, signatures),
+				cleanUp(signatures)
+			]);
+
+			await writeSignatures(signatures);
+			for (const result of results) {
+				onSuccess(result);
+			}
+			const t2 = Date.now();
+			console.log(colors.yellow(`Total build time ${t2 - t1}ms`));
+		} catch (err) {
+			process.exitCode = 1;
+			global.isError = true;
+			onError(err);
+		}
+	})();
+}
\ No newline at end of file
diff --git a/scripts/clean.js b/scripts/clean.js
new file mode 100644
index 000000000..09a2f938a
--- /dev/null
+++ b/scripts/clean.js
@@ -0,0 +1,26 @@
+'use strict';
+
+const path = require('path');
+const fs = require('fs-extra');
+const { onError } = require('./utils');
+
+const ROOT = path.resolve(__dirname, '..');
+
+async function getClean(source) {
+	await fs.remove(source);
+}
+
+module.exports = getClean;
+
+if (require.main === module) {
+	(async () => {
+		try {
+			await getClean(path.join(ROOT, 'build'));
+			await getClean(path.join(ROOT, '.signatures.json'));
+		} catch (err) {
+			process.exitCode = 1;
+			global.isError = true;
+			onError(err);
+		}
+	})();
+}
\ No newline at end of file
diff --git a/scripts/config.js b/scripts/config.js
new file mode 100644
index 000000000..990c34f69
--- /dev/null
+++ b/scripts/config.js
@@ -0,0 +1,60 @@
+// list of folders from where .js files are compiled and non-js files are symlinked
+const dirs = [
+	'chrome',
+	'components',
+	'defaults',
+	'resource',
+	'resource/web-library',
+	'test',
+	'test/resource/chai',
+	'test/resource/chai-as-promised',
+	'test/resource/mocha'
+];
+
+// list of folders from which all files are symlinked
+const symlinkDirs = [
+	'styles',
+	'translators'
+];
+
+// list of folders which are copied to the build folder
+const copyDirs = [
+	'test/tests/data'	// browser follows symlinks when loading test data
+						// triggering false-positive test results with mismatched URIs
+];
+
+// list of files from root folder to symlink
+const symlinkFiles = [
+	'chrome.manifest', 'install.rdf', 'update.rdf'
+];
+
+
+// these files will be browserified during the build
+const browserifyConfigs = [
+	{
+		src: 'node_modules/sinon/lib/sinon.js',
+		dest: 'test/resource/sinon.js',
+		config: {
+			standalone: 'sinon'
+		}
+	},
+	{
+		src: 'node_modules/chai-as-promised/lib/chai-as-promised.js',
+		dest: 'test/resource/chai-as-promised.js',
+		config: {
+			standalone: 'chaiAsPromised'
+		}
+	}
+];
+
+// exclude mask used for js, copy, symlink and sass tasks
+const ignoreMask = ['**/#*.*'];
+
+const jsFiles = [
+	`{${dirs.join(',')}}/**/*.js`,
+	`!{${symlinkDirs.concat(copyDirs).join(',')}}/**/*.js`
+];
+
+module.exports = {
+	dirs, symlinkDirs, copyDirs, symlinkFiles, browserifyConfigs, jsFiles, ignoreMask
+};
\ No newline at end of file
diff --git a/scripts/copy.js b/scripts/copy.js
new file mode 100644
index 000000000..329a2288e
--- /dev/null
+++ b/scripts/copy.js
@@ -0,0 +1,67 @@
+'use strict';
+
+const globby = require('globby');
+const path = require('path');
+const fs = require('fs-extra');
+const { getSignatures, writeSignatures, cleanUp, compareSignatures, getFileSignature, onSuccess, onError, onProgress } = require('./utils');
+const { copyDirs, ignoreMask } = require('./config');
+
+const ROOT = path.resolve(__dirname, '..');
+
+async function getCopy(source, options, signatures) {
+	const t1 = Date.now();
+	const files = await globby(source, Object.assign({ cwd: ROOT }, options ));
+	const totalCount = files.length;
+	var count = 0;
+	var f;
+
+	while ((f = files.pop()) != null) {
+		let newFileSignature = await getFileSignature(f);
+		const dest = path.join('build', f);
+
+		if (f in signatures) {
+			if (compareSignatures(newFileSignature, signatures[f])) {
+				try {
+					await fs.access(dest, fs.constants.F_OK);
+					continue;
+				} catch (_) {
+					// file does not exists in build, fallback to browserifing
+				}
+			}
+		}
+		try {
+			await fs.mkdirp(path.dirname(dest));
+			await fs.copy(f, dest);
+			onProgress(f, dest, 'cp');
+			signatures[f] = newFileSignature;
+			count++;
+		} catch (err) {
+			throw new Error(`Failed on ${f}: ${err}`);
+		}
+	}
+	
+	const t2 = Date.now();
+	return {
+		action: 'copy',
+		count,
+		totalCount,
+		processingTime: t2 - t1
+	};
+}
+
+module.exports = getCopy;
+
+if (require.main === module) {
+	(async () => {
+		try {
+			const signatures = await getSignatures();
+			onSuccess(await getCopy(copyDirs.map(d => `${d}/**`), { ignore: ignoreMask }, signatures));
+			onSuccess(await cleanUp(signatures));
+			await writeSignatures(signatures);
+		} catch (err) {
+			process.exitCode = 1;
+			global.isError = true;
+			onError(err);
+		}
+	})();
+}
\ No newline at end of file
diff --git a/scripts/js.js b/scripts/js.js
new file mode 100644
index 000000000..3fc752efa
--- /dev/null
+++ b/scripts/js.js
@@ -0,0 +1,130 @@
+const globby = require('globby');
+const path = require('path');
+const os = require('os');
+const fs = require('fs-extra');
+const cluster = require('cluster');
+const { getSignatures, compareSignatures, getFileSignature, writeSignatures, cleanUp, onSuccess, onError, onProgress } = require('./utils');
+const { jsFiles, ignoreMask } = require('./config');
+
+const NODE_ENV = process.env.NODE_ENV;
+const ROOT = path.resolve(__dirname, '..');
+
+async function getJS(source, options, signatures) {
+	const t1 = Date.now();
+	const matchingJSFiles = await globby(source, Object.assign({ cwd: ROOT }, options));
+	const cpuCount = os.cpus().length;
+	const totalCount = matchingJSFiles.length;
+	var count = 0;
+	var isError = false;
+
+	cluster.setupMaster({
+		exec: path.join(__dirname, 'babel-worker.js')
+	});
+
+	// check signatures, collect signatures for files to be processes 
+	const newFilesSignatures = {};
+	const filesForProcessing = [];
+	var f;
+	while ((f = matchingJSFiles.pop()) != null) {
+		const newFileSignature = await getFileSignature(f);
+		const dest = path.join('build', f);
+		f = path.normalize(f);
+		if (f in signatures) {
+			if (compareSignatures(newFileSignature, signatures[f])) {
+				try {
+					await fs.access(dest, fs.constants.F_OK);
+					continue;
+				} catch (_) {
+					// file does not exists in build, fallback to browserifing
+				}
+			}
+		}
+		filesForProcessing.push(f);
+		newFilesSignatures[f] = newFileSignature;
+	}
+
+	// shortcut if no files need rebuilding
+	if (Object.keys(filesForProcessing).length === 0) {
+		const t2 = Date.now();
+		return Promise.resolve({
+				action: 'js',
+				count,
+				totalCount,
+				processingTime: t2 - t1
+		});
+	}
+
+	// distribute processing among workers
+	const workerCount = Math.min(cpuCount, filesForProcessing.length);
+	var workersActive = workerCount;
+	NODE_ENV == 'debug' && console.log(`Will process ${filesForProcessing.length} files using ${workerCount} processes`);
+	return new Promise((resolve, reject) => {
+		for (let i = 0; i < workerCount; i++) {
+			var worker = cluster.fork();
+
+			worker.on('message', function(ev) {
+				if (ev.error) {
+					isError = true;
+					let errorMsg = `Failed while processing ${ev.sourcefile}: ${ev.error}`;
+					reject(errorMsg);
+				} else {
+					signatures[ev.sourcefile] = newFilesSignatures[ev.sourcefile];
+					
+					if (ev.isSkipped) {
+						NODE_ENV == 'debug' && console.log(`process ${this.id} SKIPPED ${ev.sourcefile}`);
+					} else {
+						NODE_ENV == 'debug' && console.log(`process ${this.id} took ${ev.processingTime} ms to process ${ev.sourcefile} into ${ev.outfile}`);
+						NODE_ENV != 'debug' && onProgress(ev.sourcefile, ev.outfile, 'js');
+						count++;
+					}
+				}
+
+				let nextFile = filesForProcessing.pop();
+
+				if (!isError && nextFile) {
+					NODE_ENV == 'debug' && console.log(`process ${this.id} scheduled to process ${nextFile}`);
+					this.send({
+						file: nextFile
+					});
+				} else {
+					if (this.isConnected()) {
+						this.kill();
+					}
+					NODE_ENV == 'debug' && console.log(`process ${this.id} has terminated`);
+					if (!--workersActive) {
+						const t2 = Date.now();
+						resolve({
+							action: 'js',
+							count,
+							totalCount,
+							processingTime: t2 - t1
+						});
+					}
+				}
+			});
+
+			let nextFile = filesForProcessing.pop();
+			NODE_ENV == 'debug' && console.log(`process ${worker.id} scheduled to process ${nextFile}`);
+			worker.send({
+				file: nextFile
+			});
+		}
+	});
+}
+
+module.exports = getJS;
+
+if (require.main === module) {
+	(async () => {
+		try {
+			const signatures = await getSignatures();
+			onSuccess(await getJS(jsFiles, { ignore: ignoreMask }, signatures));
+			onSuccess(await cleanUp(signatures));
+			await writeSignatures(signatures);
+		} catch (err) {
+			process.exitCode = 1;
+			global.isError = true;
+			onError(err);
+		}
+	})();
+}
\ No newline at end of file
diff --git a/scripts/sass.js b/scripts/sass.js
new file mode 100644
index 000000000..fbb02fba3
--- /dev/null
+++ b/scripts/sass.js
@@ -0,0 +1,73 @@
+'use strict';
+
+const universalify = require('universalify');
+const sass = require('node-sass');
+const globby = require('globby');
+const path = require('path');
+const fs = require('fs-extra');
+const { getSignatures, writeSignatures, cleanUp, compareSignatures, getFileSignature, onSuccess, onError, onProgress, getPathRelativeTo } = require('./utils');
+const { ignoreMask } = require('./config');
+const sassRender = universalify.fromCallback(sass.render);
+
+const ROOT = path.resolve(__dirname, '..');
+
+async function getSass(source, options, signatures) {
+	const t1 = Date.now();
+	const files = await globby(source, Object.assign({ cwd: ROOT }, options ));
+	const totalCount = files.length;
+	var count = 0;
+	var f;
+
+	while ((f = files.pop()) != null) {
+		let newFileSignature = await getFileSignature(f);
+		const dest = path.join.apply(this, ['build', 'chrome', 'skin', 'default', 'zotero', 'components', getPathRelativeTo(f, 'scss')]);
+
+		if (f in signatures) {
+			if (compareSignatures(newFileSignature, signatures[f])) {
+				try {
+					await fs.access(dest, fs.constants.F_OK);
+					continue;
+				} catch (_) {
+					// file does not exists in build, fallback to browserifing
+				}
+			}
+		}
+		try {
+			const sass = await sassRender({
+				file: f
+			});
+
+			await fs.outputFile(dest, sass);
+			onProgress(f, dest, 'sass');
+			signatures[f] = newFileSignature;
+			count++;
+		} catch (err) {
+			throw new Error(`Failed on ${f}: ${err}`);
+		}
+	}
+	
+	const t2 = Date.now();
+	return {
+		action: 'sass',
+		count,
+		totalCount,
+		processingTime: t2 - t1
+	};
+}
+
+module.exports = getSass;
+
+if (require.main === module) {
+	(async () => {
+		try {
+			const signatures = await getSignatures();
+			onSuccess(await getSass('scss/*.scss', { root: 'scss', ignore: ignoreMask }, signatures));
+			onSuccess(await cleanUp(signatures));
+			await writeSignatures(signatures);
+		} catch (err) {
+			process.exitCode = 1;
+			global.isError = true;
+			onError(err);
+		}
+	})();
+}
\ No newline at end of file
diff --git a/scripts/symlinks.js b/scripts/symlinks.js
new file mode 100644
index 000000000..a0c2d158c
--- /dev/null
+++ b/scripts/symlinks.js
@@ -0,0 +1,86 @@
+'use strict';
+
+const path = require('path');
+const fs = require('fs-extra');
+const globby = require('globby');
+
+const { isWindows, formatDirsForMatcher, getSignatures, writeSignatures, cleanUp, onSuccess, onError, onProgress } = require('./utils');
+const { dirs, symlinkDirs, copyDirs, symlinkFiles, ignoreMask } = require('./config');
+const ROOT = path.resolve(__dirname, '..');
+
+
+//@TODO: change signature to getSymlinks(source, options, signatures)
+//		 here and elsewhere
+//		 
+//		 run symlinks twice, once for files (with nodir: true)
+//		 once for dirs
+async function getSymlinks(source, options, signatures) {
+	const t1 = Date.now();
+	const files = await globby(source, Object.assign({ cwd: ROOT }, options ));
+	const filesDonePreviously = [];
+	for (const [f, signature] of Object.entries(signatures)) {
+		if ('isSymlinked' in signature && signature.isSymlinked) {
+			try {
+				await fs.access(path.join('build', f), fs.constants.F_OK);
+				// file found in signatures and build/ dir, skip
+				filesDonePreviously.push(f);
+			} catch (_) {
+				// file not found, needs symlinking
+			}
+		}
+	}
+
+	const filesToProcess = files.filter(f => !filesDonePreviously.includes(f));
+	const filesProcessedCount = filesToProcess.length;
+
+	var f;
+	while ((f = filesToProcess.pop()) != null) {
+		const dest = path.join('build', f);
+		try {
+			if (isWindows) {
+				await fs.copy(f, dest);
+			} else {
+				await fs.ensureSymlink(f, dest);
+			}
+			signatures[f] = {
+				isSymlinked: true
+			};
+			onProgress(f, dest, 'ln');
+		} catch (err) {
+			throw new Error(`Failed on ${f}: ${err}`);
+		}
+	}
+
+	const t2 = Date.now();
+
+	return {
+		action: 'symlink',
+		count: filesProcessedCount,
+		totalCount: files.length,
+		processingTime: t2 - t1
+	};
+}
+
+
+module.exports = getSymlinks;
+
+if (require.main === module) {
+	(async () => {
+		try {
+			const source = symlinkFiles
+				.concat(dirs.map(d => `${d}/**`))
+				.concat([`!${formatDirsForMatcher(dirs)}/**/*.js`])
+				.concat([`!${formatDirsForMatcher(copyDirs)}/**`]);
+
+			const signatures = await getSignatures();
+			onSuccess(await getSymlinks(source, { nodir: true, ignore: ignoreMask }, signatures));
+			onSuccess(await getSymlinks(symlinkDirs, {}, signatures));
+			onSuccess(await cleanUp(signatures));
+			await writeSignatures(signatures);
+		} catch (err) {
+			process.exitCode = 1;
+			global.isError = true;
+			onError(err);
+		}
+	})();
+}
\ No newline at end of file
diff --git a/scripts/utils.js b/scripts/utils.js
new file mode 100644
index 000000000..c2a884215
--- /dev/null
+++ b/scripts/utils.js
@@ -0,0 +1,126 @@
+const path = require('path');
+const fs = require('fs-extra');
+const colors = require('colors/safe');
+const green = colors.green;
+const blue = colors.blue;
+const yellow = colors.yellow;
+const isWindows = /^win/.test(process.platform);
+
+const ROOT = path.resolve(__dirname, '..');
+const NODE_ENV = process.env.NODE_ENV;
+
+
+function onError(err) {
+	console.log(colors.red('Error:'), err);
+}
+
+function onSuccess(result) {
+	var msg = `${green('Success:')} ${blue(`[${result.action}]`)} ${result.count} files processed`;
+	if (result.totalCount) {
+		msg += ` (out of total ${result.totalCount} matched)`; 
+	}
+
+	msg += ` [${yellow(`${result.processingTime}ms`)}]`;	
+
+	console.log(msg);
+}
+
+function onProgress(sourcefile, outfile, operation) {
+	if ('isError' in global && global.isError) {
+		return;
+	}
+	if (NODE_ENV == 'debug') {
+		console.log(`${colors.blue(`[${operation}]`)} ${sourcefile} -> ${outfile}`);
+	} else {
+		console.log(`${colors.blue(`[${operation}]`)} ${sourcefile}`);
+	}
+}
+
+async function getSignatures() {
+	let signaturesFile = path.resolve(ROOT, '.signatures.json');
+	var signatures = {};
+	try {
+		signatures = await fs.readJson(signaturesFile);
+	} catch (_) {
+		// if signatures files doesn't exist, return empty object istead
+	}
+	return signatures;
+}
+
+async function writeSignatures(signatures) {
+	let signaturesFile = path.resolve(ROOT, '.signatures.json');
+	NODE_ENV == 'debug' && console.log('writing signatures to .signatures.json');
+	await fs.outputJson(signaturesFile, signatures);
+}
+
+async function cleanUp(signatures) {
+	const t1 = Date.now();
+	var removedCount = 0, invalidCount = 0;
+
+	for (let f of Object.keys(signatures)) {
+		try {
+			// check if file from signatures exists in source
+			await fs.access(f, fs.constants.F_OK);
+		} catch (_) {
+			invalidCount++;
+			NODE_ENV == 'debug' && console.log(`File ${f} found in signatures but not in src, deleting from build`);
+			try {
+				await fs.remove(path.join('build', f));
+				removedCount++;
+			} catch (_) {
+				// file wasn't in the build either
+			}
+			delete signatures[f];
+		}
+	}
+
+	const t2 = Date.now();
+	return {
+		action: 'cleanup',
+		count: removedCount,
+		totalCount: invalidCount,
+		processingTime: t2 - t1
+	};
+}
+
+async function getFileSignature(file) {
+	let stats = await fs.stat(file);
+	return {
+		mode: stats.mode,
+		mtime: stats.mtimeMs || stats.mtime.getTime(),
+		isDirectory: stats.isDirectory(),
+		isFile: stats.isFile()
+	};
+}
+
+function compareSignatures(a, b) {
+	return typeof a === 'object'
+	&& typeof b === 'object' 
+	&& a != null
+	&& b != null
+	&& ['mode', 'mtime', 'isDirectory', 'isFile'].reduce((acc, k) => {
+		return acc ? k in a && k in b && a[k] == b[k] : false;
+	}, true);
+}
+
+function getPathRelativeTo(f, dirName) {
+	return path.relative(path.join(ROOT, dirName), path.join(ROOT, f));
+}
+
+const formatDirsForMatcher = dirs => {
+	return dirs.length > 1 ? `{${dirs.join(',')}}` : dirs[0];
+};
+
+module.exports = {
+	isWindows,
+	onError,
+	onProgress,
+	onSuccess,
+	cleanUp,
+	getSignatures,
+	getFileSignature,
+	compareSignatures,
+	writeSignatures,
+	getPathRelativeTo,
+	formatDirsForMatcher
+};
\ No newline at end of file
diff --git a/scripts/watch.js b/scripts/watch.js
new file mode 100644
index 000000000..17e0a3f9d
--- /dev/null
+++ b/scripts/watch.js
@@ -0,0 +1,81 @@
+const path = require('path');
+const chokidar = require('chokidar');
+const multimatch = require('multimatch');
+const { dirs, jsGlob, jsGlobIgnore, copyDirs, symlinkFiles } = require('./config');
+const { onSuccess, onError, getSignatures, writeSignatures, cleanUp, formatDirsForMatcher } = require('./utils');
+const getJS = require('./js');
+const getSass = require('./sass');
+const getCopy = require('./copy');
+const getSymlinks = require('./symlinks');
+
+
+const ROOT = path.resolve(__dirname, '..');
+const source = [
+	'chrome',
+	'components',
+	'defaults',
+	'resource',
+	'scss',
+	'test',
+	'styles',
+	'translators',
+	'scss',
+	'chrome/**',
+	'components/**',
+	'defaults/**',
+	'resource/**',
+	'scss/**',
+	'test/**',
+	'styles/**',
+	'translators/**',
+	'scss/**'
+];
+
+const symlinks = symlinkFiles
+				.concat(dirs.map(d => `${d}/**`))
+				.concat([`!${formatDirsForMatcher(dirs)}/**/*.js`])
+				.concat([`!${formatDirsForMatcher(copyDirs)}/**`]);
+
+var signatures;
+
+process.on('SIGINT', () => {
+	writeSignatures(signatures);
+	process.exit();
+});
+
+function getWatch() {
+	let watcher = chokidar.watch(source, { cwd: ROOT })
+	.on('change', async (path) => {
+		try {
+			if (multimatch(path, jsGlob).length && !multimatch(path, jsGlobIgnore).length) {
+				onSuccess(await getJS(path, { ignore: jsGlobIgnore }, signatures));
+			} else if (multimatch(path, 'scss/*.scss').length) {
+				onSuccess(await getSass(path, {}, signatures));
+			} else if (multimatch(path, copyDirs.map(d => `${d}/**`)).length) {
+				onSuccess(await getCopy(path, {}, signatures));
+			} else if (multimatch(path, symlinks).length) {
+				onSuccess(await getSymlinks(path, { nodir: true }, signatures));
+			}
+			onSuccess(await cleanUp(signatures));
+		} catch (err) {
+			onError(err);
+		}
+
+	})
+	.on('unlink', async () => {
+		const signatures = await getSignatures();
+		onSuccess(await cleanUp(signatures));
+	});
+
+	watcher.add(source);
+	console.log('Watching files for changes...');
+}
+
+module.exports = getWatch;
+
+if (require.main === module) {
+	(async () => {
+		signatures = await getSignatures();
+		getWatch();
+	})();
+}
\ No newline at end of file