Easily the best way to download Youtube videos for offline viewing (I use it primarily for kids videos to watch in the car...can't afford tons of mobile data traffic...don't get me started on "unlimited" data)

To get the most out of the software, you really need to donate to get all the features - however I have to say it is very much worth it - at least in my use case. The developer is really quick in responding to queries/how-to/bug reports/etc (so far at the latest within 24 hours)

Overall I am very happy with this add-on, the developer puts work into keeping it updated (yet the familiar minimalist interface stays mostly the same - wished more software packages did this....looking at you MS Office) and working around youtube's ever changing protocols - Sever time isn't free (how part of this add-on works) - I'll be donating again this year.