Rated 3 out of 5 stars

I can't download all videos in 1080p, only the ones on my account and some older ones...

This review is for a previous version of the add-on (5.7.26). 

Please try v5.7.27:

https://addons.mozilla.org/en-US/firefox/addon/complete-youtube-saver/versions/

If it doesn't fix your problem, contact us at cytsaver@hotmail.com