diff --git a/chrome/content/zotero/xpcom/quickCopy.js b/chrome/content/zotero/xpcom/quickCopy.js
index 3018dbe04..307ba33a9 100644
--- a/chrome/content/zotero/xpcom/quickCopy.js
+++ b/chrome/content/zotero/xpcom/quickCopy.js
@@ -145,7 +145,7 @@ Zotero.QuickCopy = new function() {
 			
 			// Only concern ourselves with entries containing the current domain
 			// or paths that apply to all domains
-			if (!row.domainPath.contains(urlDomain[0]) && !row.domainPath.startsWith('/')) {
+			if (!row.domainPath.indexOf(urlDomain[0]) != -1 && !row.domainPath.startsWith('/')) {
 				continue;
 			}
 			
diff --git a/chrome/content/zotero/xpcom/search.js b/chrome/content/zotero/xpcom/search.js
index 1b631ea73..c5a92eaeb 100644
--- a/chrome/content/zotero/xpcom/search.js
+++ b/chrome/content/zotero/xpcom/search.js
@@ -1123,7 +1123,7 @@ Zotero.Search.prototype._buildQuery = Zotero.Promise.coroutine(function* () {
 						let objectTypeClass = Zotero.DataObjectUtilities.getObjectsClassForObjectType(objectType);
 						
 						// Old-style library-key hash
-						if (objKey.contains('_')) {
+						if (objKey.indexOf('_') != -1) {
 							[objLibraryID, objKey] = objKey.split('_');
 						}
 						// libraryID assigned on search
diff --git a/components/zotero-protocol-handler.js b/components/zotero-protocol-handler.js
index 3bc48c506..17e342696 100644
--- a/components/zotero-protocol-handler.js
+++ b/components/zotero-protocol-handler.js
@@ -172,7 +172,7 @@ function ZoteroProtocolHandler() {
 				// search
 				// items
 				// item
-				if (params.sort.contains('/')) {
+				if (params.sort.indexOf('/') != -1) {
 					let parts = params.sort.split('/');
 					params.sort = parts[0];
 					params.direction = parts[1] == 'd' ? 'desc' : 'asc';