I took a look, and if I have a default windows theme, and default FX theme, I see another condition in [browser.css](https://searchfox.org/mozilla-central/source/browser/themes/windows/browser.css#63) that also supplies the rule this patch does. And in other themes (like Alpine and Dark), there are specific color overrides that negates the rule in this patch. Gijs or Dao, can one of you please outline the steps to reproduce?
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I took a look, and if I have a default windows theme, and default FX theme, I see another condition in [browser.css](https://searchfox.org/mozilla-central/source/browser/themes/windows/browser.css#63) that also supplies the rule this patch does. And in other themes (like Alpine and Dark), there are specific color overrides that negates the rule in this patch. Gijs or Dao, can one of you please outline the steps to reproduce because I'm also not seeing a difference?