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What is FirefoxCSS

Mozilla Firefox provides the ability to fully customise your browser using custom CSS. You can find more here r/FirefoxCSS.

Installation

1. Go to about:config and update toolkit.legacyUserProfileCustomizations.stylesheets to true.
2. Go to about:support and click "Show in Finder" in the Profile Folder field.
3. Click on folder containing all core Firefox files
4. Paste the entire "chrome" folder from this repository and restart Firefox.

Acknowledgements

• https://github.com/zvuc/firefox-macos-native-tabbar
• https://github.com/datguypiko/Firefox-Mod-Blur
• https://github.com/dannycandle/FluidFox
• https://github.com/Hann8n/Atom-for-Firefox
• https://github.com/Soft-Bred/Brave-Fox

GlassFox

• Tested only in MacOS.
• Fully transparent and transluscent.
• White pixel-sized border for the url-bar and the active tab.
• Centered url-bar.
• Brave Browser (and some Safari) Icons (all available, not all used).

Update 21/1

• Added rounded corners and white border for app-content. IMO it amplifies the modern look.

(Optional) Custom Bookmarks Bar

• Safari-like text-only bookmarks with an icon animation twist.
• Place the contents of bookmark-animation.css to userChrome.css.

(Optional) Stretched tabs

• That's a second version of the skin that has Safari-like stretched tabs.
• I removed URL-bar's border as I think it complicates the minimal aspect of the theme.
• To achieve this you need change/add the following in userChrome.css:

#urlbar-background {
    border: none !important;
}

/* Stretch Tabs */
.tabbrowser-tab[fadein]:not([pinned]) {
    max-width: none !important;
}