diff --git a/platform/firefox/vapi-client.js b/platform/firefox/vapi-client.js
index 7a8a716d4..088f34808 100644
--- a/platform/firefox/vapi-client.js
+++ b/platform/firefox/vapi-client.js
@@ -81,7 +81,7 @@ vAPI.shutdown = (function() {
     }
     var filters = self.rpc({
         fnName: 'getScriptTagFilters',
-        rootURL: self.top.location.href,
+        rootURL: self.location.href,
         frameURL: self.location.href,
         frameHostname: hostname
     });