--- a/dom/jsurl/nsJSProtocolHandler.cpp
+++ b/dom/jsurl/nsJSProtocolHandler.cpp
@@ -687,16 +687,26 @@ nsJSChannel::EvaluateScript()
     // indicate the the request is busy while the script is executing...
 
     // Note that we want to be in the loadgroup and pending while we evaluate
     // the script, so that we find out if the loadgroup gets canceled by the
     // script execution (in which case we shouldn't pump out data even if the
     // script returns it).
 
     if (NS_SUCCEEDED(mStatus)) {
+        nsCOMPtr<nsILoadInfo> loadInfo;
+        mStreamChannel->GetLoadInfo(getter_AddRefs(loadInfo));
+        if (loadInfo) {
+            // Set the channel's resultPrincipalURI to the active document's URI.
+            nsCOMPtr<nsIURI> docURI = mOriginalInnerWindow->GetDocumentURI();
+            if (docURI) {
+                loadInfo->SetResultPrincipalURI(docURI);
+            }
+        }
+
         nsresult rv = mIOThunk->EvaluateScript(mStreamChannel, mPopupState,
                                                mExecutionPolicy,
                                                mOriginalInnerWindow);
 
         // Note that evaluation may have canceled us, so recheck mStatus again
         if (NS_FAILED(rv) && NS_SUCCEEDED(mStatus)) {
             mStatus = rv;
         }