I found Video Download helper to be both easy to install and use. In the past it has stopped working for YouTube, but for about two months now it has been working again. It works for saving Gyazo videos also. Running in Firefox on Linux Mint 20.3

Najlepsza jak dla mnie aplikacja do pobierania filmów. W dalszym ciągu potwierdzam.

Muy buena la extensión !!!

It's a really useful tools for me。Anyone will love it！

Great at what it does, with great support.

Didn't work

HERO TO ZERO! This USED TO BE a great program, but the last update tossed a HUGE QR CODE in the lower third of the screen of the captured video rendering it USELESS to force purchases. Used to be a great product, and there are more tactful ways to accomplish things. REMOVED PRODUCT because of developers passive aggressive ACTIONS! Shame on him!

Best FF Add-on Extension You Can Get

When i FIRST Started using this long ago.. i remember it was super easy to use and worked great. Now.. many of the videos i want to archive are needing a Secondary Installed program (vdhcoapp)and now they all come with a QR Code watermark you must PAY to get rid of. SO.. unfortunately.. this add-in will no longer be used.

Works great!