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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