diff --git a/browserAction/browserAction.js b/browserAction/browserAction.js
index e946b00..0a54ba0 100644
--- a/browserAction/browserAction.js
+++ b/browserAction/browserAction.js
@@ -63,20 +63,20 @@
 	const actionDefinitions = [
 		{
 			label: "settings",
-			icon: browser.extension.getURL("icons/pageAction-showOptions.svg"),
+			icon: extension.getURL("icons/pageAction-showOptions.svg"),
 			action: function(){
 				if (browser.runtime && browser.runtime.openOptionsPage){
 					browser.runtime.openOptionsPage();
 				}
 				else {
-					window.open(browser.extension.getURL("options/options.html"), "_blank");
+					window.open(extension.getURL("options/options.html"), "_blank");
 				}
 				window.close();
 			}
 		},
 		{
 			label: "faq",
-			icon: browser.extension.getURL("icons/browserAction-faq.svg"),
+			icon: extension.getURL("icons/browserAction-faq.svg"),
 			action: function(){
 				window.open("https://canvasblocker.kkapsner.de/faq/", "_blank");
 				window.close();
@@ -85,7 +85,7 @@
 		{
 			label: "test",
 			advanced: true,
-			icon: browser.extension.getURL("icons/browserAction-test.svg"),
+			icon: extension.getURL("icons/browserAction-test.svg"),
 			action: function(){
 				window.open("https://canvasblocker.kkapsner.de/test", "_blank");
 				window.close();
@@ -93,7 +93,7 @@
 		},
 		{
 			label: "review",
-			icon: browser.extension.getURL("icons/browserAction-review.svg"),
+			icon: extension.getURL("icons/browserAction-review.svg"),
 			action: function(){
 				window.open("https://addons.mozilla.org/firefox/addon/canvasblocker/reviews/", "_blank");
 				window.close();
@@ -101,7 +101,7 @@
 		},
 		{
 			label: "reportIssue",
-			icon: browser.extension.getURL("icons/browserAction-reportIssue.svg"),
+			icon: extension.getURL("icons/browserAction-reportIssue.svg"),
 			action: function(){
 				window.open("https://github.com/kkapsner/CanvasBlocker/issues", "_blank");
 				window.close();
@@ -149,7 +149,7 @@
 		
 		search.addEventListener("keypress", function(event){
 			if ([10, 13].indexOf(event.keyCode) !== -1){
-				window.open(browser.extension.getURL(
+				window.open(extension.getURL(
 					"options/options.html" +
 					"?search=" +
 					encodeURIComponent(this.value)
diff --git a/lib/extension.js b/lib/extension.js
index 38b4e02..bd21d81 100644
--- a/lib/extension.js
+++ b/lib/extension.js
@@ -72,7 +72,11 @@
 		return container;
 	};
 	
-	scope.extensionID = browserAvailable? browser.extension.getURL(""): "extensionID";
+	scope.getURL = function getURL(str){
+		return (browser.runtime.getURL? browser.runtime.getURL: browser.extension.getURL)(str);
+	};
+	
+	scope.extensionID = browserAvailable? scope.getURL(""): "extensionID";
 	
 	scope.inIncognitoContext = browserAvailable? browser.extension.inIncognitoContext: false;
 	
diff --git a/lib/main.js b/lib/main.js
index 1c38902..fc3c63b 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -10,6 +10,7 @@
 	const persistentRndStorage = require("./persistentRndStorage");
 	const notification = require("./notification");
 	const mobile = require("./mobile");
+	const extension = require("./extension");
 	
 	const registerSettingsContentScript = (function(){
 		let unregisterSettingsContentScript = function(){};
@@ -161,7 +162,7 @@
 				!browser.pageAction.openPopup
 			){
 				browser.tabs.create({
-					url: browser.extension.getURL("options/options.html?notice=" + reason)
+					url: extension.getURL("options/options.html?notice=" + reason)
 				});
 			}
 		}
@@ -170,7 +171,7 @@
 				logging.message("CanvasBlocker installed");
 				openOptions(details.reason);
 				browser.tabs.create({
-					url: browser.extension.getURL("options/presets.html?notice=" + details.reason)
+					url: extension.getURL("options/presets.html?notice=" + details.reason)
 				});
 				break;
 			case "update":
diff --git a/lib/theme.js b/lib/theme.js
index 995912f..437fc14 100644
--- a/lib/theme.js
+++ b/lib/theme.js
@@ -13,9 +13,10 @@
 	}
 	
 	const settings = require("./settings");
+	const extension = require("./extension");
 	
 	scope.init = function(page){
-		const basePath = browser.extension.getURL("themes");
+		const basePath = extension.getURL("themes");
 		
 		const baseLink = document.createElement("link");
 		baseLink.href = `${basePath}/base/layout.css`;
diff --git a/options/options.js b/options/options.js
index c156dcb..e0507a9 100644
--- a/options/options.js
+++ b/options/options.js
@@ -577,7 +577,7 @@
 	
 	const version = document.createElement("div");
 	version.className = "version";
-	fetch(browser.extension.getURL("manifest.json")).then(function(response){
+	fetch(extension.getURL("manifest.json")).then(function(response){
 		return response.json();
 	}).then(function(manifest){
 		version.textContent = "Version " + manifest.version;
diff --git a/pageAction/pageAction.js b/pageAction/pageAction.js
index ad1b080..18bd555 100644
--- a/pageAction/pageAction.js
+++ b/pageAction/pageAction.js
@@ -30,7 +30,7 @@
 							browser.runtime.openOptionsPage();
 						}
 						else {
-							window.open(browser.extension.getURL("options/options.html"), "_blank");
+							window.open(extension.getURL("options/options.html"), "_blank");
 						}
 					}
 				},
@@ -152,7 +152,7 @@
 			isIcon: true,
 			callback: function({domain, urls}){
 				window.open(
-					browser.extension.getURL(
+					extension.getURL(
 						"options/whitelist.html?domain=" +
 						encodeURIComponent(domain) +
 						"&urls=" +