There are a few, but I'm not sure if they're close enough for you or not: https://addons.mozilla.org/en-US/firefox/addon/google-chrome-light https://addons.mozi

There are a few, but I'm not sure if they're close enough for you or not: https://addons.mozilla.org/en-US/firefox/addon/google-chrome-light https://addons.mozilla.org/en-US/firefox/addon/google-chrome... Truthfully, I don't think that Firefox and Chromium look all that different, to me it seems like it's the same layout just different margins/colors/tab styles? So I'm not sure what the biggest issues would be to change. Notably, Firefox also has userChrome.css (https://www.userchrome.org/ https://www.userchrome.org/), so if themes aren't able to get you where you want, it's possible that there's a more extensive change that someone has compiled in a user style. https://firefoxcss-store.github.io/index.html https://firefoxcss-store.github.io/index.html, https://github.com/muckSponge/MaterialFox https://github.com/muckSponge/MaterialFox might be good places to start looking, although I don't have personal experience with either source so this isn't a recommendation.