The hidden preferences/flags which were used to activate and enable new Proton UI in Firefox testing builds, still work in public stable versions of Firefox and we can modify those preferences to disable new Proton UI and re-enable classic UI.įollowing screenshot shows old classic theme and UI restored successfully in Firefox newer versions: Upcoming “Proton” Design Refresh UI in Mozilla Firefoxįollowing screenshot shows new Proton UI enabled in Mozilla Firefox web browser:Īlthough the new visual design is refreshing and might please lots of users but there are some Firefox users who don’t like the new UI and want to bring back the good ol’ classic theme in their browser.įortunately, it’s possible to get the old theme and UI back in Firefox at least for now. We told you about the new Proton UI when it was under development and testing and was available in Firefox testing versions such as Nightly builds. The new redesigned UI is fresh and modern and has been developed to provide similar interface for different devices. If you upgraded or installed newer versions of Mozilla Firefox web browser such as 89 and later, you might have noticed the new white/grey theme and UI which is called “ Proton UI“. This article will help you in restoring old classic theme and User Interface (UI) in Mozilla Firefox 89.0 and later versions. New Working Method to Restore Classic Theme and UI in Firefox 91 and Later Versions The background-color property is specified as a single > value.UPDATE: A new working method available at following link to disable new Proton UI and restore classic UI in Firefox 91.0 and later versions: 25% transparent */ /* Special keyword values */ background-color : currentcolor background-color : transparent /* Global values */ background-color : inherit background-color : initial background-color : revert background-color : unset * Keyword values */ background-color : red background-color : indigo /* Hexadecimal value */ background-color : #bbff00 /* Fully opaque */ background-color : #bf0 /* Fully opaque shorthand */ background-color : #11ffee00 /* Fully transparent */ background-color : #1fe0 /* Fully transparent shorthand */ background-color : #11ffeeff /* Fully opaque */ background-color : #1fef /* Fully opaque shorthand */ /* RGB value */ background-color : rgb (255, 255, 128 ) /* Fully opaque */ background-color : rgba (117, 190, 218, 0.5 ) /* 50% transparent */ /* HSL value */ background-color : hsl (50, 33%, 25% ) /* Fully opaque */ background-color : hsla (50, 33%, 25%, 0.75 ) /* 75% opaque, i.e.
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