had a doubt, had to check it worked as intended

platform/chromium/vapi-client.js

@@ -37,6 +37,7 @@ var chrome = self.chrome;
 // https://github.com/gorhill/uBlock/issues/456
 // Already injected?
 if ( vAPI.vapiClientInjected ) {
+    //console.debug('vapi-client.js already injected: skipping.');
     return;
 }