fix: don't let finalUrl to be undefined (#1537)

src/background/utils/requests.js

@@ -271,7 +271,7 @@ function xhrCallbackWrapper(req) {
         numChunks,
         type,
         data: shouldNotify && {
-          finalUrl: req.url,
+          finalUrl: req.url || xhr.responseURL,
           ...getResponseHeaders(),
           ...objectPick(xhr, ['readyState', 'status', 'statusText']),
           ...('loaded' in evt) && objectPick(evt, ['lengthComputable', 'loaded', 'total']),