Легко можно скачать обложку видео

This works super well. Glad I found this one, because it's not intrusive, just a little button in the nav bar, and works to view AND download thumbnails (just right-click and save the image from the preview) – perfectly fine!

Doesn't work. Just gives an image of the YouTube logo. Waste of time.

I mean, it works... The only problem with this is that you've to first open the video to be able to download the thumb. Which kinda loses 60% of he point of wanting a addon to download ytb thumbs 😐
Better than nothing i guess.

Very simple, just adds a button at the end of your address bar that shows the thumbnail once clicked.

Best Add-on of it's kind!

It's button is only shown on supported websites. So you don't waste space on the firefox UI.

Developer reacts to feature suggestions on github. 👍

So good and easy to use. Hope to have more choice of quality.