Good at deleting ads, but seems to mess with sites too much. e.g. on gumtree.com or github.com, necessary functionality would stop working (like login links) until I disabled it.

Very pleasant ad-free browsing.

Worst adblocker i tried so far. Every single ad from youtube interrupts the content i´m trying to watch as if there where nothing preventing it.
Absolute 0.

It's a awesome app.Thanks.

It stops the majority of ads that could potentially popup to annoy you. This is a good addon that I would recommend to any FF user as a must have in your FF tool kit.