Recently coming over to Firefox from Chrome, an ad blocker was the first extension I looked for. This ad blocker is super fast and effective, I've had no issues so far (minus one I will detail a bit further down) and highly recommend it to anyone who's tired of the endless sea of ads on the internet of today. The only issue I've come across is no fault of the extension, rather that the Facebook ad banner on the right hand side changes code every time you open the page, and if you choose to block all similar text, the chat bar disappears. Not at all the fault of AdBlocker, just annoying Facebook garbage. 5/5 stars!