> It doesn't "still work" if you're on Firefox.

Not my experience at all. I run uMatrix on every computer I have and it is awesome. Still annoyed it was replaced by uBo which is quite good, but nowhere as nice as uMatrix. Luckily uMatrix still works great.

I wish they'd just scrap the uBo interface and replace it with the uMatrix interface which is far superior.

They do different things. I'm using both: uBO for ads and hiding UI elements, uMatrix for JS. I wish that the author could support both but time is limited and I'm OK with that.

By the way, I realized that most of the tabs where I'm logged into something run inside their own tab container, so that limits the damage that any bug on handling cookies can do.