diff --git a/lib/intercept.js b/lib/intercept.js
index 953a5b2..c675509 100644
--- a/lib/intercept.js
+++ b/lib/intercept.js
@@ -65,12 +65,7 @@
 			scope.intercept({subject: window}, apis);
 		}
 		else  {
-			let firefoxVersion = navigator.userAgent.match(/Firefox\/([\d.]+)$/);
-			let forceLoad = true;
-			if (firefoxVersion){
-				let versionParts = firefoxVersion[1].split(".");
-				forceLoad = parseInt(versionParts[0], 10) >= 57;
-			}
+			let forceLoad = false;
 			let preIntercepted = false;
 			let intercepted = false;
 			const forEachFunction = function(callback){
diff --git a/manifest.json b/manifest.json
index 40efa38..1f69875 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,7 +1,7 @@
 {
 	"name": "CanvasBlocker",
 	"description": "__MSG_addon_description__",
-	"version": "0.4.3-Development",
+	"version": "0.4.3a-Development",
 	"icons": {
 		"48": "icons/icon.svg",
 		"96": "icons/icon.svg"
diff --git a/releaseNotes.txt b/releaseNotes.txt
index d364ee0..deb4deb 100644
--- a/releaseNotes.txt
+++ b/releaseNotes.txt
@@ -1,7 +1,10 @@
-Version 0.4.3:
+Version 0.4.3a:
+	known issues:
+		- due to API blocking some web pages may break. Use 0.4.3b instead.
+	
 	changes:
 		- hide white, black and ignore list as they can be done with the url specific settings. They are still present and working in the background.
-		- if settings are not loaded fast enough the loading is not force but all APIs are blocked (only Firefox < 57)
+		- if settings are not loaded fast enough the loading is not force but all APIs are blocked
 	
 	new features:
 		- reset settings