En Firefox 88 no funciona.

doesn1 work

Не работает.

Does not function at all as advertised. Any time I've put lists of keywords into the field, it will only recognize a few at best. Regularly only recognizes the first one in the list or none at all.

is a feces

It doesnt work for the update mozilla firfox

Having more than 3 entries causes it to hang.

Not working, please fix it, I'll rate accordingly

I don't understand why it needs to "access data for all websites." That's seriously suspicious.

Worked for a few days and then stopped

Not working on Linux Firefox 57 Quantum

It worked for couple of days and it stopped working
Changing my rating to 1 because the developer doesn't seem to interested in replying to issues.