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
Guarateed compatibility with Firefox 99. There has recently been in change in
Firefox that requires the use of -moz-platform instead of -moz-os-version to
use OS-specific CSS. This will work from 99.0b1 upwards but might not on older
versions, so be aware of that. If you run an older version of Firefox and have
an issue, change this back.
(Also, since the only OS-specific CSS in the file targets Windows, it should not
affect you on Mac or Linux either way.)
It should work on newer versions as well unless there’s any breaking changes in
how userChrome.css works.
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 in your URL bar, search for
toolkit.legacyUserProfileCustomizations.stylesheets and set it to true.
Go to about:profiles in your URL bar, click /”Open Directory”/ next to your Root
Directory under your default profile.
If there is no chrome folder, create it.
Create a file called userChrome.css inside the chrome folder.
Copy and paste the contents of userChrome.css into your file (or symlink it).
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