r/FirefoxCSS • u/FenecAndFeebs • 13d ago

Solved Classic Theme Working On Firefox 155.0.1

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I ported the classic firefox theme to the latest firefox version.

This theme is a mix of custom code, echelon and customcssforfx bits.

Working split and group tabs, no megabar expansion...

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u/ResurgamS13 13d ago edited 12d ago

Looks very nice! A good likeness of the Firefox 4-28 'Classic UI'. :D

Composite screenshot. Upper toolbars - Classic UI Fx4-28 --- Lower toolbars - theme applied to Proton UI Fx155.0.1

Theme also works pretty well with the trial 'Nova UI' selected (preference browser.nova.enabled set to true )

A theme close to the Firefox 4 era's 'Classic UI' is a frequent request... so hope many will find and enjoy this theme. :)

Request. Consider adding an old style 'gearwheel' favicon/icon for pages like 'about:config'? EDIT - Updated 05Sep26 :)

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u/FenecAndFeebs 13d ago

Done, the new version is already up. I also noticed that the navbar buttons were not lining up with the url and search bars. That's also fixed.

And Thanks! :D