Since there is no way, of creating a poll, please all that want the old GUI back, post "me too". The reason behind it is, that people should not be forced to create a social media account to do so and that this is the only way developers get a feeling of what is wanted. This is not meant as a demand towards the developers, it is just a means of evaluation to help considering decisions. Why, do I do this? Because, "classic theme restorer" add on isn't really reversing it. Others that had that problem and a crippled solution: https://support.mozilla.org/en-US/questions/1018434?esab=a&as=aaq https://support.mozilla.org/en-US/questions/1032824?esab=a&as=aaq solution: https://support.mozilla.org/en-US/kb/how-to-make-new-firefox-look-like-old-firefox Someone did put it down very nice elsewhere: "it is a shame that people actually HAVE to create an addon for it".