There are several extensions for Firefox that have made the internet a far, far more hospitable place. Obviously, Adblock Plus is at the top of the list. NoScript ranks second. But recently I added another two extensions.
Extended Cookie Manager makes it easy to enable or disable cookies from sites that you're visiting, which has been a game-changer for me. It's so easy to choose what sites I want to receive cookies from that I now browse with cookies completely disabled. For the very few sites that I have to sign into (such as Tumblr or my bank), it's a quick click to enable cookies.
Second, I just this morning installed BetterPrivacy, which allows me to manage Flash cookies (cookies that Firefox isn't able to delete). The oldest Flash cookie on my computer is from 2005! Appalling. Hopefully BetterPrivacy turns out to be as helpful as Extended Cookie Manager.
Here's to a cleaner internet experience.