Tool : Firefox Prefs.js Cleaner I would really love Firefox to be more strict about uninstalling it’s addons. Just like Windows, when you uninstall an addon, it leaves behind it’s preferences in the prefs.js file, which over time can grow in size. I really needed something similar to Revo for Firefox. Welcome to FFPCleaner … I created FFPCleaner for this purpose. It parses and then display all add