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Some UI features on Firefox can be customized using userChrome.css [1]. I bet you can make title bar as small as you like and change search highlight color. For

• throwie 5y ago
  Regarding the search highlight color, Firefox has the (mis)feature that if the highlight background color is too close to the text background color (which is the case for yellow vs. white background), then it inverts the search highlight text and background color, i.e. you get yellow text on black background for the highlight, instead of black text on yellow background. The rationale is accessiblity, i.e. requiring a minimum contrast for the highlight background against the normal background. But for me that behavior is anti-accessibility, and it can't be turned off. The issue has been raised since the behavior was introduced in 2009, but the maintainers don't want to change it. The corlor inversion implementation also seems to be pretty deep in the stack, and tied to the HTML <mark> tag. Regarding font rendering, there have been multiple issue reports over the years, although most users complain that Firefox doesn't render text like Chrome, which I tend to find even worse than Firefox. ;)