This theme goal is to create a compact mode that follows Firefox 89 (known as Proton) design system while using the same vertical space as the compact mode in Firefox 88 (known as Photon).
- Type about:config in the address bar and press Enter/Return.
- Click the button accepting the risk.
- In the search box above the list, type or paste
toolkit.legacyUserProfileCustomizations.stylesheets. - Double-click the
toolkit.legacyUserProfileCustomizations.stylesheetspreference to switch the value from false to true. - Now, search for
browser.compactmode.showand set it totrue. - Close about:config tab.
- Open your profile folder (See How do I find my profile?)
- Go to chrome folder or create it if it doesn't exist
- Copy/Paste the userChrome.css file from this repository inside the chrome folder.
- Enjoy! :)
Size difference between (from left to right) regular, compact and ultra compact mode
Dark theme:
Light theme: