


Many Firefox users didn’t like the new UI changes specially the floating tabs feature ( More Info). Mozilla team increased vertical spacing or padding in all menus to make them touch-friendly.įollowing screenshot shows new Proton UI present in Firefox 89 and later versions: The menus, context menus, etc were also redesigned to look clean and refreshing. Also the titlebar or tab bar became light grey and doesn’t follow the colorization functionality of the operating system (such as Windows 10). The new Proton theme features round floating tabs which are not connected with the toolbar. When Mozilla team released Firefox 89 version, it came with a brand new Proton design UI or User Interface ( Review). If you upgraded to new version of Mozilla Firefox web browser such as version 91.0 or later, you might have immediately noticed that old methods or workarounds (about:config) to restore classic theme and UI in Firefox no longer work. This article contains a new working method to disable new Proton UI and restore old classic theme and UI in Firefox 91 and later versions.
