Firefox Vertical Theme

Last updated August 2024 - Supports Firefox 128+

This is designed custom fit for me, so don't expect much configurability. macOS users can take a try before I tested its compability.

Enable firefox vertical tabs

Native vertical tabs are now available in the latest stable version of Firefox.

If it is not displayed or is collapsed, open the vertical tabs using the sidebar button, then:

With the exception of a slightly misaligned ui, native vertical tabs are available. This project is about yo fix these problem.

go to about:config in your URL bar, search for toolkit.legacyUserProfileCustomizations.stylesheets and set it to true
locate the firefox profile folder by going to the hamburger menu > help > more torubleshooting information
click show in finder or open folder next to profile folder
open the highlighted folder (should look something like "13s123f4.default-release")
create a folder named "chrome" if it doesn't exist already
paste files from repo into this folder, or git clone https://github.com/nathandaven/firefox-paradise-theme.git and restart firefox (command-q/alt-f4 and reopen)

If you doesn't use the latest version of Firefox, please check the older version in release / tag page.
install Tab Center Reborn
open the extension settings, enable compact mode, and copy the contents of tab-center-reborn.css into the stylesheet section
profit