It's free and lets you easily manage a proxy list from Firefox, but you'll need to install another program to use everything that ProxySel has to offer.
ProxySel fits snugly into your Firefox menu bar and features a drop-down menu for editing, sorting, and importing proxy lists. There is also a feature for easily adjusting your browser anonymity settings. Your proxy list also is displayed in a drop-down menu. Each proxy has a star-based rating system, with one star being OK, and four stars being superior. You can add your own rating to each proxy server. Beyond that, … Read more