This is quite useful and, even though there is the occasional glitch requiring reloading the page or clearing the cache, I think it's worth the 5 stars (and a contribution!).

I would like to see a more detailed description of just how the download takes place (I may unpack the xpi and take a peek).

Update: I had a glitch and contacted the developer - and got a very quick and helpful response. This addon is definitely worth supporting.

And another update: once again I needed to contact the developer and received very, very quick turnaround with helpful information. This add-on has been very useful to me for a number of years now.
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November 2025 update...

Dishita has added update after update to this add-on to keep up with Google/YT's changes, and deserves much credit for perseverance and innovation.