Excellent Rated 5 out of 5 stars
This is my favourite FireFox add-on and the developer is always very quick to update it when there are any changes in FireFox or YouTube etc.
To the other reviewers who take time to leave a negative review just becase the add-on is temporarily broken for a few days (likely because of changes outside the developer's control):
Making a donation to the developer is likely to get the issue resolved much quicker than leaving a demotivating review or comment.
Rated 5 out of 5 stars
My favourite add-on! There are regular updates and it can also do file conversion!This review is for a previous version of the add-on (4.4.1).