Firefox: The last time we highlighted uBlock, a fast and lightweight alternative to AdBlock Plus, it was Chrome only. Now the add-on is available for Firefox as well, and it works well, even though it's still in beta.
There's no getting around the fact that as useful as AdBlock Plus is, it's probably one of the most memory-intensive add-ons you can install. In Chrome, it's a dramatic improvement in memory usage, and you get the same protection, to boot. Its new Firefox extension works pretty much the same way, and while it's in beta, you get the same level of protection as the Chrome extension and as AdBlock Plus, since it uses the same lists (namely EasyList, EasyPrivacy, Malware Domains -- or you can add and customise your own sources to block).
There are a few known issues though -- the badge counter that shows you how many ads you've blocked is known to double-count, so it may report that it's blocking more ads than it is (even though it blocks everything on the page by default), and the badge button may look a little strange depending on your version of Firefox. Even so, we tested it and it works well, which is the important part, and it's lean on memory. Hit the link below to read more and grab it for yourself.