Allow easy switching between Firefox UI themes without userChrome.css

[Lucas2]

I’d love to see Firefox provide official built-in options to switch between different Firefox UI designs, instead of forcing users to rely on userChrome.css or unsupported tweaks.

Many users still prefer older Firefox interfaces because of familiarity, compactness, workflow, or overall aesthetics. Right now, keeping those designs alive usually requires custom CSS that often breaks after updates.

It would be amazing if Firefox offered an easy Appearance setting with options like:

• Australis
• Photon
• Proton
• Nova
• System Default

Benefits:

• Preserves Firefox’s long tradition of customization
• Gives users more freedom and comfort
• Reduces dependency on fragile CSS hacks
• Helps long-time users stay with Firefox
• Makes UI experimentation less frustrating

Firefox has always been known for user choice. Offering official UI theme switching would strengthen that identity and make customization accessible to everyone, not just advanced users.

What do you think?

[Jon]

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[JMAC1978]

Please give me the choice to bring back the old 3 dot menu in secret menu for android, in all others forks the same bad redesign is forced, i will keep using the browser old version with no more security updates because is faster and easy to use.

Sad days when so many people asking for the option to change to the old ui and 3 dots for months go ignored, mozila wants to be chrome like when there are so many of those i don't needed any.

As long time Mozilla user since version 3.6 just disapointed the same bad ui is in iceraven, fennec and Firefox you have no choice but old insecure software that works perfect.

[ikpjr]

If a mod manager existed for Firefox, it would be an (unofficial?) option easing customization for advanced as well as other users, touching some of your described benefits points.

Although it wouldn't beat native integration(for most non power users or on the issue of breaking changes) it probably would be more welcome than the status quo.

It makes sense for such a customization tool to exist, since it's not reasonable to expect FF(or other browser) devs to accommodate every (power) user wanted modifications on its settings, maybe only the most commonly used or requested ones that make sense to integrate.

After all if one wants a specific UI customization there's DevTools for experimenting and tweaking(basically it's kind of settings tweaker for UI).

And maybe some mods can find their way into being regularly showcased, highlighted(by Firefox teams and/or community) or even integrated into FF.

The mod manager besides enabling/disabling sets of mods(sets of CSS and/or JS files), could also function like a package manager for getting  and applying(with previous review and approval) the latest mod changes.

It could also generate (automatically) screenshots or videos of its UI(for FF - as it permits this for its UI or "chrome" as opposed to just webpage content) for each mod set.

Perusing through GitHub, I casually found mod managers for Vivaldi(DKN if currently working).

For Firefox IDKN if there's one such type of app.