diff --git a/platform/firefox/frameModule.js b/platform/firefox/frameModule.js
index f4f6829ac..94d1c6931 100644
--- a/platform/firefox/frameModule.js
+++ b/platform/firefox/frameModule.js
@@ -168,9 +168,6 @@ const contentObserver = {
             type: type,
             url: location.spec
         };
-        if ( type === 7 ) {
-            details.attrSrc = context.frameElement.getAttribute('src');
-        }
 
         if ( typeof messageManager.sendRpcMessage === 'function' ) {
             // https://bugzil.la/1092216
diff --git a/platform/firefox/vapi-background.js b/platform/firefox/vapi-background.js
index 1a216b16d..c32e26c8f 100644
--- a/platform/firefox/vapi-background.js
+++ b/platform/firefox/vapi-background.js
@@ -1311,9 +1311,6 @@ vAPI.net.registerListeners = function() {
             type: details.type,
             url: details.url
         };
-        if ( details.attrSrc !== undefined ) {
-            lastRequest[0].attrSrc = details.attrSrc;
-        }
     };
 
     vAPI.messaging.globalMessageManager.addMessageListener(