Firefox Vertical Tabs

Vertical tabs for Firefox, inspired by Edge.

Works with Light theme, Dark theme, and System theme (auto dark mode). There are some minor glitches with Alpenglow, but they should be easy to fix.

It also plays nice with Container Tabs.

Screenshots

Compatibility

Compatible with Firefox 90.

I have only tested this for Linux and macOS. There might be some bugs on Windows because the window decorations look different. I can’t test this because I don’t have a Windows computer, but if you find any bugs and know how to fix it, feel free to submit a PR.

How to install

• Go to about:config, search for toolkit.legacyUserProfileCustomizations.stylesheets and set it to true.
• Add the userChrome.css to your Firefox profile.
• Install Tab Center Reborn extension.
• Go to about:addons, select Tab Center Reborn, go to Preferences and set:
  • Animations: on.
  • Use current browser theme: on, if you want to use dark mode.
  • Compact Mode: either “Dynamic” or “Enabled”. It works with “Disabled” too but looks nicer with only favicons.
  • Favicon-only pinned tabs: off.
  • Activate Custom Stylesheet and paste the contents of tabCenterReborn.css into the text area, and click “Save CSS”.
• Restart Firefox.