Addons are mostly platform indepedent and work on Firefox for any OS. Click the tools menu -> add ons, then click the "get extensions" link and search. Be aware that flashblock blocks all flash and instead shows a play button for you to click on to enable a particular piece of flash. Don't install this if flash doesn't bother you, just rely on noscript to deal with it. Noscript blocks all scripts by default so you have to enable scripts on your first visit to a site. After that it remembers which sites you want to allow scripts on by adding them to a whitelist. Adblock is self explanatory you can subscribe to maintainted blacklists or simply use it to block ad banners yourself manually.