diff --git a/chrome/content/zotero-platform/win/overlay.css b/chrome/content/zotero-platform/win/overlay.css
index d27d45ec7..50b074aca 100644
--- a/chrome/content/zotero-platform/win/overlay.css
+++ b/chrome/content/zotero-platform/win/overlay.css
@@ -219,11 +219,6 @@ toolbar:not([id="nav-bar"]) #zotero-toolbar-buttons separator {
 	padding-top: 4px;
 }
 
-#zotero-tb-fullscreen {
-	margin-left: 2px;
-	margin-right: 5px;
-}
-
 #zotero-view-tabbox tab {
 	padding-left: .7em;
 	padding-right: .7em;
diff --git a/chrome/content/zotero/overlay.js b/chrome/content/zotero/overlay.js
index 932583dd6..03bdbabe7 100644
--- a/chrome/content/zotero/overlay.js
+++ b/chrome/content/zotero/overlay.js
@@ -29,7 +29,7 @@
 var ZoteroOverlay = new function()
 {
 	const DEFAULT_ZPANE_HEIGHT = 300;
-	var toolbarCollapseState, showInPref;
+	var toolbarCollapseState;
 	var zoteroPane, zoteroSplitter;
 	var _stateBeforeReload = false;
 	
@@ -119,31 +119,6 @@ var ZoteroOverlay = new function()
 				throw new Error("Skipping loading");
 			}
 			
-			// Open Zotero app tab, if in Fx 4 and requested by pref
-			showInPref = Components.classes["@mozilla.org/preferences-service;1"]
-								.getService(Components.interfaces.nsIPrefService)
-								.getBranch('extensions.zotero.').getIntPref('showIn');
-			this.isTab = showInPref !== 1;
-			
-			var observerService = Components.classes["@mozilla.org/observer-service;1"]
-				.getService(Components.interfaces.nsIObserverService);
-			var zoteroObserver = function(subject, topic, data) {
-				if(subject != window) return;
-				observerService.removeObserver(this, "browser-delayed-startup-finished");
-				if(showInPref === 3) {
-					var tabbar = document.getElementById("TabsToolbar");
-					if(tabbar && window.getComputedStyle(tabbar).display !== "none") {
-						// load Zotero as a tab, if it isn't loading by default
-						ZoteroOverlay.loadZoteroTab(true);
-					}
-				} else if(showInPref === 1) {
-					// close Zotero as a tab, in case it was pinned
-					var zoteroTab = ZoteroOverlay.findZoteroTab();
-					if(zoteroTab) gBrowser.removeTab(zoteroTab);
-				}
-			};
-			observerService.addObserver(zoteroObserver, "browser-delayed-startup-finished", false);
-			
 			ZoteroPane.init();
 			
 			// Clear old Zotero icon pref
@@ -264,71 +239,6 @@ var ZoteroOverlay = new function()
 			}
 		}
 	}
-	
-	/**
-	 * Determines whether there is an open Zotero tab
-	 */
-	this.findZoteroTab = function() {
-		// Look for an existing tab
-		var tab = false;
-		var numTabs = gBrowser.browsers.length;
-		for(var index = 0; index < numTabs; index++) {
-			var currentBrowser = gBrowser.getBrowserAtIndex(index);
-			if(ZOTERO_TAB_URL == currentBrowser.currentURI.spec) {
-				tab = (gBrowser.tabs ? gBrowser.tabs : gBrowser.mTabs)[index];
-				break;
-			}
-		}
-		
-		return tab;
-	}
-	
-	/**
-	 * Loads the Zotero tab, or adds a new tab if no tab yet exists
-	 * @param {Boolean} background Whether the Zotero tab should be loaded in the background
-	 */
-	this.loadZoteroTab = function(background) {
-		var tab = this.findZoteroTab();
-		
-		// If no existing tab, add a new tab
-		if(!tab) tab = gBrowser.addTab(ZOTERO_TAB_URL);
-		// Pin tab
-		if(showInPref == 3) gBrowser.pinTab(tab);
-		// If requested, activate tab
-		if(!background) gBrowser.selectedTab = tab;
-	}
-	
-	/**
-	 * Toggle between Zotero as a tab and Zotero as a pane
-	 */
-	this.toggleTab = function(setMode) {
-		var tab = this.findZoteroTab();
-		window.zoteroSavedCollectionSelection = ZoteroPane.collectionsView.selectedTreeRow.id;
-		window.zoteroSavedItemSelection = ZoteroPane.itemsView.saveSelection();
-		if(tab) {		// Zotero is running in a tab
-			if(setMode) return;
-			// if Zotero tab is the only tab, open the home page in a new tab
-			if((gBrowser.tabs ? gBrowser.tabs : gBrowser.mTabs).length === 1) {
-				gBrowser.addTab(gBrowser.homePage);
-			}
-			
-			// swap ZoteroPane object
-			ZoteroPane = ZoteroPane_Overlay;
-			
-			// otherwise, close Zotero tab and open Zotero pane
-			gBrowser.removeTab(tab);
-			this.isTab = false;
-			this.toggleDisplay();
-		} else {		// Zotero is running in the pane
-			if(setMode === false) return;
-			// close Zotero pane
-			this.toggleDisplay(false);
-			
-			// open Zotero tab
-			this.isTab = true;
-			this.loadZoteroTab();
-		}
-	}
 }
 
 window.addEventListener("load", function(e) {
diff --git a/chrome/content/zotero/preferences/preferences_advanced.xul b/chrome/content/zotero/preferences/preferences_advanced.xul
index 3f9a5080b..05f5de473 100644
--- a/chrome/content/zotero/preferences/preferences_advanced.xul
+++ b/chrome/content/zotero/preferences/preferences_advanced.xul
@@ -45,7 +45,6 @@
 			<preference id="pref-openURL-version" name="extensions.zotero.openURL.version" type="string"/>
 			<preference id="pref-keys-openZotero" name="extensions.zotero.keys.openZotero" type="string"/>
 			<preference id="pref-keys-saveToZotero" name="extensions.zotero.keys.saveToZotero" type="string"/>
-			<preference id="pref-keys-toggleFullscreen" name="extensions.zotero.keys.toggleFullscreen" type="string"/>
 			<preference id="pref-keys-library" name="extensions.zotero.keys.library" type="string"/>
 			<preference id="pref-keys-quicksearch" name="extensions.zotero.keys.quicksearch" type="string"/>
 			<preference id="pref-keys-toggleTagSelector" name="extensions.zotero.keys.toggleTagSelector" type="string"/>
diff --git a/chrome/content/zotero/preferences/preferences_advanced_firefox.xul b/chrome/content/zotero/preferences/preferences_advanced_firefox.xul
index a408a50e0..7890faf73 100644
--- a/chrome/content/zotero/preferences/preferences_advanced_firefox.xul
+++ b/chrome/content/zotero/preferences/preferences_advanced_firefox.xul
@@ -55,12 +55,6 @@
 								<textbox id="textbox-openZotero" maxlength="1" size="1" preference="pref-keys-openZotero"/>
 							</row>
 							
-							<row insertbefore="zotero-keys-new-item">
-								<label value="&zotero.preferences.keys.toggleFullscreen;" control="textbox-toggleFullscreen"/>
-								<label class="modifier"/>
-								<textbox id="textbox-toggleFullscreen" maxlength="1" size="1" preference="pref-keys-toggleFullscreen"/>
-							</row>
-							
 							<row insertbefore="zotero-keys-new-item">
 								<label value="&zotero.preferences.keys.saveToZotero;" control="key-textbox-saveToZotero"/>
 								<label class="modifier"/>
diff --git a/chrome/content/zotero/preferences/preferences_general_firefox.xul b/chrome/content/zotero/preferences/preferences_general_firefox.xul
index 0bc040001..7eb55dd4e 100644
--- a/chrome/content/zotero/preferences/preferences_general_firefox.xul
+++ b/chrome/content/zotero/preferences/preferences_general_firefox.xul
@@ -28,28 +28,11 @@
 <overlay xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
 	<prefpane id="zotero-prefpane-general">
 		<preferences id="zotero-prefpane-general-preferences">
-			<preference id="pref-showIn" name="extensions.zotero.showIn" type="int"/>
 			<preference id="pref-launchNonNativeFiles" name="extensions.zotero.launchNonNativeFiles" type="bool"/>
 			<preference id="pref-parseEndNoteMIMETypes"
 				name="extensions.zotero.parseEndNoteMIMETypes"
 				type="bool" onchange="Zotero.MIMETypeHandler.init()"/>
 		</preferences>
-		<groupbox id="zotero-prefpane-general-groupbox">
-			<grid id="zotero-prefpane-general-grid">
-				<rows id="zotero-prefpane-general-rows">
-					<row position="1">
-						<hbox align="center">
-							<label value="&zotero.preferences.showIn;" control="showAs"/>
-						</hbox>
-						<radiogroup id="showIn" orient="horizontal" preference="pref-showIn">
-							<radio id="zotero-prefpane-general-showIn-browserPane" label="&zotero.preferences.showIn.browserPane;" value="1"/>
-							<radio id="zotero-prefpane-general-showIn-separateTab" label="&zotero.preferences.showIn.separateTab;" value="2"/>
-							<radio id="zotero-prefpane-general-showIn-appTab" label="&zotero.preferences.showIn.appTab;" value="3"/>
-						</radiogroup>
-					</row>
-				</rows>
-			</grid>
-		</groupbox>
 		<groupbox id="zotero-prefpane-miscellaneous-groupbox">
 			<checkbox id="launchNonNativeFiles-checkbox"
 				preference="pref-launchNonNativeFiles"
diff --git a/chrome/content/zotero/tab.js b/chrome/content/zotero/tab.js
deleted file mode 100644
index 7f7e5fba4..000000000
--- a/chrome/content/zotero/tab.js
+++ /dev/null
@@ -1,139 +0,0 @@
-/*
-    ***** BEGIN LICENSE BLOCK *****
-    
-    Copyright © 2009 Center for History and New Media
-                     George Mason University, Fairfax, Virginia, USA
-                     http://zotero.org
-    
-    This file is part of Zotero.
-    
-    Zotero is free software: you can redistribute it and/or modify
-    it under the terms of the GNU Affero General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-    
-    Zotero is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU Affero General Public License for more details.
-    
-    You should have received a copy of the GNU Affero General Public License
-    along with Zotero.  If not, see <http://www.gnu.org/licenses/>.
-    
-    ***** END LICENSE BLOCK *****
-*/
-
-/*
- * This object contains the various functions for the interface
- */
-var ZoteroTab = new function()
-{
-	this.onLoad = function() {
-		var me = this;
-		
-		// find window this tab is loaded in
-		this.containerWindow = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
-		   .getInterface(Components.interfaces.nsIWebNavigation)
-		   .QueryInterface(Components.interfaces.nsIDocShell)
-		   .chromeEventHandler.ownerDocument.defaultView;
-		if(!this.containerWindow) return;
-		
-		var tabs = (this.containerWindow.gBrowser.tabs
-					? this.containerWindow.gBrowser.tabs : this.containerWindow.gBrowser.mTabs);
-		
-		// loop over all browsers in this window
-		for(var i=0; i<this.containerWindow.gBrowser.browsers.length; i++) {
-			var currentBrowser = this.containerWindow.gBrowser.browsers[i];
-			if(currentBrowser.contentWindow == window) {
-				// find containerBrowser and containerTab
-				this.containerBrowser = currentBrowser;
-				this.containerTab = tabs[i];
-				continue;
-			}
-			
-			// if we somehow ended up with other Zotero tabs in the window, close them
-			if(currentBrowser && ZOTERO_TAB_URL == currentBrowser.currentURI.spec) {
-				this.containerWindow.gBrowser.removeTab(tabs[i]);
-			}
-		}
-		
-		// stop drop events from propagating
-		this.containerBrowser.addEventListener("drop", _dropPropagationKiller, false);
-		
-		// initialize ZoteroPane and swap out old window ZoteroPane object
-		if(this.containerWindow.ZoteroPane) {
-			this._swapZoteroPane();
-		} else {
-			this.containerWindow.addEventListener("load", function() { this._swapZoteroPane() }, false);
-		}
-		
-		// get tab for browser
-		if(this.containerWindow.gBrowser.selectedTab === this.containerTab) {
-			// if tab is already selected, init now
-			ZoteroPane.init();
-			ZoteroPane.makeVisible();
-		} else {
-			// otherwise, add a handler to wait until this tab is selected
-			var listener = function(event) {
-				if(event.target !== me.containerTab) return;
-				me.containerWindow.gBrowser.tabContainer.removeEventListener("TabSelect", listener, false);
-				ZoteroPane.init();
-				ZoteroPane.makeVisible();
-			}
-			this.containerWindow.gBrowser.tabContainer.addEventListener("TabSelect", listener, false);
-		}
-		
-		if(Zotero && Zotero.Prefs.get("showIn") != 2) {
-			// on Fx 4, add an event listener so the pinned tab isn't restored on close
-			var pinnedTabCloser = function() {
-				try {
-					me.containerWindow.gBrowser.removeTab(me.containerTab);
-				} catch(e) {}
-			}
-			var observerService = Components.classes["@mozilla.org/observer-service;1"]
-				.getService(Components.interfaces.nsIObserverService);
-			observerService.addObserver(pinnedTabCloser, "quit-application-requested", false);
-			this.containerWindow.addEventListener("close", pinnedTabCloser, false);
-		}
-	}
-	
-	this._swapZoteroPane = function() {
-		if(!this.containerWindow.ZoteroOverlay.isTab) {
-			var tabs = (this.containerWindow.gBrowser.tabs
-						? this.containerWindow.gBrowser.tabs : this.containerWindow.gBrowser.mTabs);
-			if(tabs.length > 1) {
-				window.close();
-			} else {
-				if(tabs[0].pinned) this.containerWindow.gBrowser.unpinTab(tabs[0]);
-				document.location.replace(this.containerWindow.gHomeButton.getHomePage());
-			}
-			return;
-		}
-		
-		this.containerWindow.ZoteroPane_Overlay = this.containerWindow.ZoteroPane;
-		this.containerWindow.ZoteroPane_Tab = ZoteroPane;
-		this.containerWindow.ZoteroPane = ZoteroPane;
-	}
-	
-	this.onUnload = function() {
-		// remove drop propagation killer
-		this.containerBrowser.removeEventListener("drop", _dropPropagationKiller, false);
-		
-		// replace window ZoteroPane
-		if(this.containerWindow.ZoteroPane === this.containerWindow.ZoteroPane_Tab) {
-			this.containerWindow.ZoteroPane = this.containerWindow.ZoteroPane_Overlay;
-		}
-		delete this.containerWindow.ZoteroPane_Tab;
-		
-		// destroy pane
-		ZoteroPane.destroy();
-	}
-	
-	function _dropPropagationKiller(event) {
-		event.stopPropagation();
-		event.preventDefault();
-	}
-}
-
-window.addEventListener("load", function(e) { ZoteroTab.onLoad(e); }, false);
-window.addEventListener("unload", function(e) { ZoteroTab.onUnload(e); }, false);
diff --git a/chrome/content/zotero/tab.xul b/chrome/content/zotero/tab.xul
deleted file mode 100644
index 02b7687ae..000000000
--- a/chrome/content/zotero/tab.xul
+++ /dev/null
@@ -1,66 +0,0 @@
-<?xml version="1.0"?>
-
-<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
-<?xml-stylesheet href="chrome://zotero/skin/zotero.css" type="text/css"?>
-<?xml-stylesheet href="chrome://zotero/skin/tab.css" type="text/css"?>
-<?xml-stylesheet href="chrome://zotero-platform/content/tab.css" type="text/css"?>
-<?xul-overlay href="chrome://zotero/content/zoteroPane.xul"?>
-<?xul-overlay href="chrome://zotero/content/itemPane.xul"?>
-
-<!DOCTYPE window [
-<!ENTITY % globalDTD SYSTEM "chrome://global/locale/global.dtd">
-%globalDTD;
-<!ENTITY % textcontextDTD SYSTEM "chrome://global/locale/textcontext.dtd" >
-%textcontextDTD;
-<!ENTITY % standaloneDTD SYSTEM "chrome://zotero/locale/standalone.dtd" >
-%standaloneDTD;
-<!ENTITY % brandDTD SYSTEM "chrome://branding/locale/brand.dtd" >
-%brandDTD;
-]>
-
-<page id="zotero-tab" title="Zotero" role="application"
-		xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
-		xmlns:xhtml="http://www.w3.org/1999/xhtml" disablefastfind="true"
-		flex="1"> 
-	
-	<script type="application/javascript" src="tab.js"/>
-	<script type="application/javascript"
-		src="chrome://global/content/contentAreaUtils.js"/>
-	<xhtml:link rel="shortcut icon"
-		href="chrome://zotero/skin/zotero-new-z-16px.png" style="display:none"/>
-	<popup id="contentAreaContextMenu">
-		<menuitem id="context-undo"
-				label="&undoCmd.label;"
-				accesskey="&undoCmd.accesskey;"
-				command="cmd_undo"/>
-		<menuseparator id="context-sep-undo"/>
-		<menuitem id="context-cut"
-				label="&cutCmd.label;"
-				accesskey="&cutCmd.accesskey;"
-				command="cmd_cut"/>
-		<menuitem id="context-copy"
-				label="&copyCmd.label;"
-				accesskey="&copyCmd.accesskey;"
-				command="cmd_copy"/>
-		<menuitem id="context-paste"
-				label="&pasteCmd.label;"
-				accesskey="&pasteCmd.accesskey;"
-				command="cmd_paste"/>
-		<menuitem id="context-delete"
-				label="&deleteCmd.label;"
-				accesskey="&deleteCmd.accesskey;"
-				command="cmd_delete"/>
-		<menuseparator id="context-sep-paste"/>
-		<menuitem id="context-selectall"
-				label="&selectAllCmd.label;"
-				accesskey="&selectAllCmd.accesskey;"
-				command="cmd_selectAll"/>
-	</popup>
-	<commandset id="mainCommandSet"/>
-	<hbox flex="1" id="browser">
-		<vbox id="appcontent" flex="1">
-			<stack id="zotero-pane-stack" fullscreenmode="true" flex="1"/>
-		</vbox>
-	</hbox>
-	<keyset id="mainKeyset"/>
-</page>
diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index 25b1a8595..d57a1d8d2 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -22,7 +22,6 @@
     
     ***** END LICENSE BLOCK *****
 */
-const ZOTERO_TAB_URL = "chrome://zotero/content/tab.xul";
 
 /*
  * This object contains the various functions for the interface
@@ -395,7 +394,8 @@ var ZoteroPane = new function()
 		this.updateTagSelectorSize();
 		
 		// restore saved row selection (for tab switching)
-		var containerWindow = (window.ZoteroTab ? window.ZoteroTab.containerWindow : window);
+		// TODO: Remove now that no tab mode?
+		var containerWindow = window;
 		if(containerWindow.zoteroSavedCollectionSelection) {
 			this.collectionsView.addEventListener('load', Zotero.Promise.coroutine(function* () {
 				yield this.collectionsView.selectByID(containerWindow.zoteroSavedCollectionSelection);
@@ -725,9 +725,6 @@ var ZoteroPane = new function()
 				case 'toggleTagSelector':
 					ZoteroPane_Local.toggleTagSelector();
 					break;
-				case 'toggleFullscreen':
-					ZoteroPane_Local.toggleTab();
-					break;
 				case 'copySelectedItemCitationsToClipboard':
 					ZoteroPane_Local.copySelectedItemsToClipboard(true)
 					break;
@@ -4713,17 +4710,6 @@ var ZoteroPane = new function()
 		}
 	}
 	
-	/**
-	 * Toggles Zotero-as-a-tab by passing off the request to the ZoteroOverlay object associated
-	 * with the present window
-	 */
-	this.toggleTab = function() {
-		var wm = Components.classes["@mozilla.org/appshell/window-mediator;1"]
-						   .getService(Components.interfaces.nsIWindowMediator);
-		var browserWindow = wm.getMostRecentWindow("navigator:browser");
-		if(browserWindow.ZoteroOverlay) browserWindow.ZoteroOverlay.toggleTab();
-	}
-
 	/**
 	 * Sets the layout to either a three-vertical-pane layout and a layout where itemsPane is above itemPane
 	 */
@@ -4747,9 +4733,7 @@ var ZoteroPane = new function()
 	 */
 	this.show = function() {
 		if(window.ZoteroOverlay) {
-			if(ZoteroOverlay.isTab) {
-				ZoteroOverlay.loadZoteroTab();
-			} else if(!this.isShowing()) {
+			if (!this.isShowing()) {
 				ZoteroOverlay.toggleDisplay();
 			}
 		}
diff --git a/chrome/content/zotero/zoteroPane.xul b/chrome/content/zotero/zoteroPane.xul
index 7e6ceba47..829d93156 100644
--- a/chrome/content/zotero/zoteroPane.xul
+++ b/chrome/content/zotero/zoteroPane.xul
@@ -248,9 +248,7 @@
 							<label id="zotero-tb-sync-last-sync"/>
 						</tooltip>
 					</toolbarbutton>
-					<toolbarseparator id="zotero-fullscreen-close-separator" class="standalone-no-display"/>
 
-					<toolbarbutton id="zotero-tb-fullscreen" tooltiptext="&zotero.toolbar.tab.tooltip;" oncommand="ZoteroPane_Local.toggleTab();" class="zotero-tb-button standalone-no-display"/>
 					<toolbarbutton id="zotero-close-button" class="tabs-closebutton close-icon standalone-no-display" oncommand="ZoteroOverlay.toggleDisplay()"/>
 				</hbox>
 			</toolbar>
diff --git a/chrome/locale/en-US/zotero/preferences.dtd b/chrome/locale/en-US/zotero/preferences.dtd
index 7701bbe77..ec1cbb8bb 100644
--- a/chrome/locale/en-US/zotero/preferences.dtd
+++ b/chrome/locale/en-US/zotero/preferences.dtd
@@ -8,10 +8,6 @@
 <!ENTITY zotero.preferences.prefpane.general				"General">
 
 <!ENTITY zotero.preferences.userInterface				"User Interface">
-<!ENTITY zotero.preferences.showIn						"Load Zotero in:">
-<!ENTITY zotero.preferences.showIn.browserPane					"Browser pane">
-<!ENTITY zotero.preferences.showIn.separateTab					"Separate tab">
-<!ENTITY zotero.preferences.showIn.appTab					"App tab">
 <!ENTITY zotero.preferences.layout							"Layout:">
 <!ENTITY zotero.preferences.layout.standard		"Standard">
 <!ENTITY zotero.preferences.layout.stacked			"Stacked">
diff --git a/chrome/locale/en-US/zotero/zotero.dtd b/chrome/locale/en-US/zotero/zotero.dtd
index 6a13497af..4f195ad92 100644
--- a/chrome/locale/en-US/zotero/zotero.dtd
+++ b/chrome/locale/en-US/zotero/zotero.dtd
@@ -123,7 +123,6 @@
 <!ENTITY zotero.toolbar.supportAndDocumentation		"Support and Documentation">
 <!ENTITY zotero.toolbar.about.label					"About Zotero">
 <!ENTITY zotero.toolbar.advancedSearch				"Advanced Search">
-<!ENTITY zotero.toolbar.tab.tooltip					"Toggle Tab Mode">
 <!ENTITY zotero.toolbar.openURL.label					"Locate">
 <!ENTITY zotero.toolbar.openURL.tooltip				"Find through your local library">
 
diff --git a/chrome/skin/default/zotero/overlay.css b/chrome/skin/default/zotero/overlay.css
index 707b8abec..55e2ed6b1 100644
--- a/chrome/skin/default/zotero/overlay.css
+++ b/chrome/skin/default/zotero/overlay.css
@@ -612,16 +612,6 @@
 	color: gray;
 }
 
-#zotero-tb-fullscreen
-{
-	list-style-image: url('chrome://zotero/skin/toolbar-fullscreen-bottom.png');
-}
-
-#zotero-pane-stack[fullscreenmode="true"] #zotero-tb-fullscreen
-{
-	list-style-image: url('chrome://zotero/skin/toolbar-fullscreen-top.png');
-}
-
 #zotero-tb-search
 {
 	font-size: 11px !important;
diff --git a/chrome/skin/default/zotero/preferences.css b/chrome/skin/default/zotero/preferences.css
index 7955ebbdd..4ca9dbc10 100644
--- a/chrome/skin/default/zotero/preferences.css
+++ b/chrome/skin/default/zotero/preferences.css
@@ -73,11 +73,6 @@ grid row hbox:first-child
 }
 
 
-#showIn radio
-{
-	width: 120px;
-}
-
 #fontSize radio
 {
 	margin-right: 20px;
diff --git a/defaults/preferences/zotero.js b/defaults/preferences/zotero.js
index 375a586c8..2b0e43125 100644
--- a/defaults/preferences/zotero.js
+++ b/defaults/preferences/zotero.js
@@ -25,7 +25,6 @@ pref("extensions.zotero.triggerProxyAuthentication", true);
 // Proxy auth URLs should respond successfully to HEAD requests over HTTP and HTTPS (in case of forced HTTPS requests)
 pref("extensions.zotero.proxyAuthenticationURLs", 'http://www.acm.org,http://www.ebscohost.com,http://www.elsevier.com,http://www.ieee.org,http://www.jstor.org,http://www.ovid.com,http://www.springer.com,http://www.tandfonline.com');
 pref("extensions.zotero.cacheTranslatorData",true);
-pref("extensions.zotero.showIn", 1);
 pref("extensions.zotero.browserContentContextMenu", true);
 pref("extensions.zotero.openURL.resolver","http://worldcatlibraries.org/registry/gateway");
 pref("extensions.zotero.openURL.version","1.0");