I'm using yD - Youtube downloader for FireFox. It seemed like the least intrusive (options were very limited at the time), and I keep it disabled until I want to use it.
You can try this one (let me know how it works for you - I haven't tried it):
I used to use something similar but it refused to D/L some of the videos I wanted. And then it stopped working for anything I cared about. Some of these require you to install a "helper" program, which is probably very risky. So be cautious when using any of these downloaders.
I'm using yD - Youtube downloader for FireFox. It seemed like the least intrusive (options were very limited at the time), and I keep it disabled until I want to use it.
You can try this one (let me know how it works for you - I haven't tried it):
https://y2mate.guru/en8/
I used to use something similar but it refused to D/L some of the videos I wanted. And then it stopped working for anything I cared about. Some of these require you to install a "helper" program, which is probably very risky. So be cautious when using any of these downloaders.