UPDATE, August 19, 2022:
Well, the latest version arrived just in time to fuck up my browser when the old version was disabled, meaning that while I tried to figure out what the fuck was going on, I lost out on a time sensitive video that's no longer available! Thanks a lot fucksticks, you've managed to prove you're retarded as ever. How about a fucking heads-up next time you stupid shit stains? Put a fucking indicator dot or something on the menu bar icon to let people know it needs to be updated, for fucks sake, how fucking hard is that!!! Not that it would really matter, i suppose, considering it's next to fucking impossible to open the settings page when there's no video to download or it's not being detected.... Testing it now; still slower than fuck on larger videos=bullshit. Used to be one click downloading, now multiple clicks to start=more fucking bullshit. I fucking HATE that you removed the progress bar!!! Whose bright idea was that?!! Is there some sort of never ending contest around the office to see which asshole can shit out the biggest log of an update? Great job ass-hats, can't wait for your next colossal, fecal brainstorm.

OG, late December 2021:
This used to work brilliantly until you decided to f*** with it and you broke it...STOP TRYING TO FIX THINGS THAT AREN'T BROKEN!!!!!

UPDATE, January 7, 2022:
"Currently, we're unable to reproduce the issue, but we suspect it may be caused when updating from version 4.9 to 4.10, and then to 4.11-4.12.

The problem may be in the data left from version 4.9. Unlike Chromium-based browsers, Firefox does not delete extension storage when you uninstall it, even in debugging mode.

Try resetting Ant Video downloader, go to Settings - Reset, click the WIPE OUT AND RESET button. This will delete any data in the extension storage, and reload the extension."

I've uninstalled and updated to the "latest version" which on my settings page shows "Version 4.11 (build 1, release)", NOT version 4.12 and there is no "Settings - Reset" option and no "WIPE OUT AND RESET button" anywhere to be seen...

WHAT THE EVER LOVING FUCK ARE YOU TALKING ABOUT?!!! STOP FUCKING ABOUT AND REVERT IT BACK TO 4.9 WHICH WORKED JUST FINE YOU STUPID FUCKING ASSHOLES!!!!!!