diff --git a/package.json b/package.json
index d2891a1..90b034e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "turn-off-the-lights-browser-extension",
-  "version": "4.5.3",
+  "version": "4.5.5",
   "description": "Browser extension",
   "homepage": "https://wwww.turnoffthelights.com",
   "author": "Stefan Van Damme",
diff --git a/src/manifests/safari.json b/src/manifests/safari.json
index a72491e..583ba69 100644
--- a/src/manifests/safari.json
+++ b/src/manifests/safari.json
@@ -10,8 +10,7 @@
     }
   },
   "background": {
-    "scripts": ["scripts/constants.js", "scripts/background.js"],
-    "persistent": false
+    "service_worker": "scripts/background.js"
   },
   "commands": {
     "_execute_action": { 
diff --git a/src/scripts/background.js b/src/scripts/background.js
index 7a41f8c..384ee86 100755
--- a/src/scripts/background.js
+++ b/src/scripts/background.js
@@ -28,10 +28,8 @@ To view a copy of this license, visit http://creativecommons.org/licenses/GPL/2.
 //================================================
 
 // Importing the constants
-// Check if the browser supports service workers
-// Safari uses a background script because iOS service workers are quickly terminated
-if(typeof importScripts === "function"){
-	// Importing the constants only if importScripts is available
+// Execute if importScripts is support such as Google Chrome and not Firefox
+if(typeof importScripts !== "undefined"){
 	// eslint-disable-next-line no-undef
 	importScripts("constants.js");
 }
@@ -1068,7 +1066,7 @@ if(chrome.storage.managed){
 }
 
 function installation(){
-	if(chrome.storage.managed){
+	if(chrome.storage.managed && exbrowser != "firefox"){
 		chrome.storage.managed.get(function(items){
 			readgrouppolicy(items);
 			// save in memory
@@ -1082,13 +1080,8 @@ function installation(){
 }
 
 chrome.runtime.onInstalled.addListener(function(){
-	console.log("hello installation");
 	installation();
 	if(chrome.runtime.setUninstallURL){
 		chrome.runtime.setUninstallURL(linkuninstall);
 	}
-});
-
-chrome.runtime.onStartup.addListener(function(){
-	console.log("hello startup");
 });
\ No newline at end of file
diff --git a/xcode/Turn-Off-the-Lights-Safari-extension/Config.xcconfig b/xcode/Turn-Off-the-Lights-Safari-extension/Config.xcconfig
index 733f219..9802d0c 100644
--- a/xcode/Turn-Off-the-Lights-Safari-extension/Config.xcconfig
+++ b/xcode/Turn-Off-the-Lights-Safari-extension/Config.xcconfig
@@ -9,5 +9,5 @@
 // https://help.apple.com/xcode/#/dev745c5c974
 
 // Update the version number here for all platforms
-VERSION = 4.5.4
-BUILD_NUMBER = 134
+VERSION = 4.5.5
+BUILD_NUMBER = 135
diff --git a/xcode/Turn-Off-the-Lights-Safari-extension/Turn Off the Lights for Safari.xcodeproj/project.xcworkspace/xcuserdata/stefanvandamme.xcuserdatad/UserInterfaceState.xcuserstate b/xcode/Turn-Off-the-Lights-Safari-extension/Turn Off the Lights for Safari.xcodeproj/project.xcworkspace/xcuserdata/stefanvandamme.xcuserdatad/UserInterfaceState.xcuserstate
index 8fcc701..06c5f54 100644
Binary files a/xcode/Turn-Off-the-Lights-Safari-extension/Turn Off the Lights for Safari.xcodeproj/project.xcworkspace/xcuserdata/stefanvandamme.xcuserdatad/UserInterfaceState.xcuserstate and b/xcode/Turn-Off-the-Lights-Safari-extension/Turn Off the Lights for Safari.xcodeproj/project.xcworkspace/xcuserdata/stefanvandamme.xcuserdatad/UserInterfaceState.xcuserstate differ