TabGroups? - I didn't know I needed this until they removed it! Fixed. ClassicThemeRestorer? - because they did WHAT to the UI? CookieMonster and AdvancedCookieManager? - because firefox removed real cookie management CleanLinks? - not sure why this one, actually CopyUrlsExpert? - Catnews would be impossible without this DuckDuckGo? Plus - SURELY there's an easier way to put alternate search engines in as the default search? RefControl? and NoScript? - still Duh. uBlockOrigin? replaces the venerable addblock. RequestPolicy? and Decentraleyes adds to that. (Developing locally is sooo annoying without permitting cross-site) OpenInBrowser? - seriously "This is an html page, would you like to save it?" NO! OPEN IT. YOU'RE A WEB BROWSER, IDIOT!