Changed extension version to 4.3a2

- Added temporary update URL to test keyboard shortcut migration
- Changed minVersion to 78.0 (newest ESR)

wx-src/manifest.json

@@ -2,13 +2,14 @@
     "manifest_version": 2,
     "name": "__MSG_extName__",
     "description": "__MSG_extDesc__",
-    "version": "4.3a1+",
-    "homepage_url": "http://aecreations.sourceforge.net/panicbutton/index.php",
+    "version": "4.3a2",
+    "homepage_url": "https://aecreations.sourceforge.io/panicbutton/index.php",
     "author": "AE Creations",
 
-    "applications": {
+    "browser_specific_settings": {
 	"gecko": {
-	    "strict_min_version": "68.0"
+	  "strict_min_version": "78.0",
+	  "update_url": "https://aecreations.github.io/updates/update-test.json"
 	}
     },