Developer reply by cg-addons
Rated 5 out of 5 stars
Does not wanna save some videos, here is one https://www.youtube.com/watch?v=HZsqfD_8Was What gives?
Save as did the trick, thanks :)
Are you using "Save to Default Folder"? Try "Save As", it should work. We are working on a fix for the default folder issue.
To create your own collections, you must have a Mozilla Add-ons account.