Drop down menu on Youtube always returns "no links were found".

I'm using a firefox extension and up until yesterday it worked great. Starting yesterday the drop down menu on Youtube always returns "no links were found". The green "download 720p" button on a video page still works and savefrom.net still returns a working drop down menu. But on Youtube the drop down menu now goes "Download..." and then "no links were found". Every time. Maybe it times out too fast or something, since savefrom.net site still finds the links. Ether way, it would be nice to have it fixed.