Basically this is more directed at Google. If they are going to re-design Gmail so that it renders Firefox extensions useless, why not create the option to play with the look themselves? This was a great little extension – I guess too great. Unless someone out there can "crack the code," there's not much you can do execpt change the language to English (UK). Gmail Skins still won't work, but you'll still be able to use the Better Gmail extension and whatever you can find at userstyles.org

You think the creator would update or at least answer questions, guess he's sick of updating himself.