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

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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.