If this slows down your web browsing, then it's mainly because you already have an Ad Blocker Extension. Remove the Ad Blocker Extension you have and re-install this one.

Gets the Job done - Block unwanted ads

This extension reduces the speed of the web, and the test shows that the Speedometer2 invented by Apple has reduced by at least 10 points.

Very useful; blocks ads in Gmail that other extensions do not

jvfdrzwswses

I get a lot of notices about how ghostery is slowing down firefox. Especially if I open up more than three tabs at once. Some page, e.g. business central (ms garbage) I have to disable completely because it makes the page unusable and will sometimes crash the browser.

Funktioniert sehr gut

Very good Ad blocker!
Takes care of Fox's very annoying popups about you using an Ad blocker. Gives you a choice of reading, or not the "Comments" sections to the articles listed.
The only one I have found to do so.
Perfect!