I'm learning french and looking for good videos in youtube with audio and captions in french. With the readlang's chrome extension it becomes a great tool, because you can translate (and look up in the dictionary) the words in the transcript viewer, and if you click in the time indicator you may also navigate trough the video without having to disable the extension.
I think that it would be a good feature if there was the option to add videos as bookmarks (instead of importing them), and having a separate tab in readlang for this bookmarked videos. In the future, users may compile a great set of videos, being a valuable resource for learning.
When adding a bookmark, the possibility of adding a comment would be fine too, so the user may add info like: clear pronunciation, slow speaking, audio+captions in french...
And upvoting the bookmarks for filtering purposes.