downloading youtube videos stopped working

Get glimmerblocker, it will allow downloading of hd video in mp4 format.

 

I just find the file in the Activity window that has the largest filesize. Many times that is "videoplayback" (with no extension) which is actually an MP4.

 

I always used to do this myself too. But recently it doesn't seem to work for me. So I have been using a free program called MacTubes and that works well (in spite of the fact that it often puts up an alert saying there was an error).

 

I recently went through all this malarky it took a long time but eventually I came across FastestTube which is a Safari extension that adds a download button to youtube videos. Couldn't be simpler.