this post was submitted on 30 Nov 2025
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As far as I know, that's not possible. I don't think there has been any change to this, as Mozilla considers userChrome.css a deprecated feature (though they don't plan on removing it).
That's both disheartening and good to know. IMHO FF wastes too much vertical and horizontal space in the bars at the top of the page. I always liked being able to shrink those down, hopefully they will continue to support it