Firefox is fast, but you can squeeze a little more speed out of it by not having it draw all those ads that are on almost every web page. I use Adblock Plus to keep them from showing up. It works great, blocking nearly every ad and not messing up the page layout. If you do run into the occasional problem with it, you can easily disable the plugin for the particular page or site. On the other hand, if you get an ad that you shouldn’t it’s easy to let Adblock know about it and have it remove it in the future. Once you’ve got Adblock installed, make sure you set it up for a filter subscription, which it will prompt you to do once you restart Firefox. This will make sure Adblock knows about the latest ads and how to block them.