There is AdBlock Plus and AdBlock : https://getadblock.com/ AdBlock is not available on the FireFox add-on store but AdBlock Plus is. I contacted AdBlock to ask for the reason but they never mentioned why they were taken off. They just said I can install the add-on from their website. Any one knows why? Should I stop using it? I use this specific add-on because there is just 1 guy behind and its extremely useful so I usually advertise it to other people and donated money to the developer.