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[–] 7 points 1 month ago

Basically, you can write a CSS file to override the stylings that Firefox uses in its UI. So, you can't edit the basic HTML-like structure, but yeah, you can do a lot with CSS.

Probably best resource to read up on this: https://www.userchrome.org/
There's also a community here on Lemmy: !FirefoxCSS@fedia.io

If you want precisely the layout that OP has, they'd have to post their CSS file...

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