diff --git a/chrome/content/zotero/xpcom/utilities_internal.js b/chrome/content/zotero/xpcom/utilities_internal.js
index 9f70593f05..1f49ee7a12 100644
--- a/chrome/content/zotero/xpcom/utilities_internal.js
+++ b/chrome/content/zotero/xpcom/utilities_internal.js
@@ -2031,13 +2031,6 @@ Zotero.Utilities.Internal.activate = new function() {
 	
 	return function(win) {
 		if (Zotero.isMac) {
-			const BUNDLE_IDS = {
-				"Zotero":"org.zotero.zotero",
-				"Firefox":"org.mozilla.firefox",
-				"Aurora":"org.mozilla.aurora",
-				"Nightly":"org.mozilla.nightly"
-			};
-			
 			if (win) {
 				Components.utils.import("resource://gre/modules/ctypes.jsm");
 				win.focus();
@@ -2075,7 +2068,13 @@ Zotero.Utilities.Internal.activate = new function() {
 					);
 				}, false);
 			} else {
-				Zotero.Utilities.Internal.executeAppleScript('tell application id "'+BUNDLE_IDS[Zotero.appName]+'" to activate');
+				let pid = Zotero.Utilities.Internal.getProcessID();
+				let script = `
+					tell application "System Events"
+						set frontmost of the first process whose unix id is ${pid} to true
+					end tell
+				`;
+				Zotero.Utilities.Internal.executeAppleScript(script);
 			}
 		} else if(!Zotero.isWin && win) {
 			Components.utils.import("resource://gre/modules/ctypes.jsm");
@@ -2289,16 +2288,26 @@ Zotero.Utilities.Internal.activate = new function() {
 
 Zotero.Utilities.Internal.sendToBack = function() {
 	if (Zotero.isMac) {
+		let pid = Zotero.Utilities.Internal.getProcessID();
 		Zotero.Utilities.Internal.executeAppleScript(`
 			tell application "System Events"
-				if frontmost of application id "org.zotero.zotero" then
-					set visible of process "Zotero" to false
+				set myProcess to first process whose unix id is ${pid}
+				if frontmost of myProcess then
+					set visible of myProcess to false
 				end if
 			end tell
 		`);
 	}
 }
 
+
+Zotero.Utilities.Internal.getProcessID = function () {
+	return Components.classes["@mozilla.org/xre/app-info;1"]
+		.getService(Components.interfaces.nsIXULRuntime)
+		.processID;
+};
+
+
 /**
  *  Base64 encode / decode
  *  From http://www.webtoolkit.info/