There is a very good reason that this add-on is the only Firefox add-on that I ever paid for a "PRO" activation key. It is just that good. It is super easy to use and very robust. Can't ask for much more from a browser add-on.

I have absolutely no idea how many videos I have downloaded, but it is an impressive number and this add-on has either always worked, or when Youtube changed things, the add-on was quickly updated to work with the changes. That is a level of service that is worth buying the developer a coffee or buying a "PRO" activation key.