it has been one of my favorite add-ons for Firefox, sites load faster without having to download all those ads, and the interface looks cleaner.
one thing that the previous version had that was better than the new version, is that you could whitelist a specific part of the site while allowing what you wanted to go through. now I have the problem in some sites that Adblock mistakenly blocks some essential parts of the site, and the only way to see that essential, is by letting all the ads go through.
its all or nothing, either you get infested by ads all around, or see a broken website lacking essentials.