Firefox 89.0 is the latest stable version of the Firefox web browser. Released on June 1, 2021, it ships with major interface changes, a new custom theme, and more. The focus of the release is the interface redesign that is affecting major interface elements such as the main toolbar, address bar, menus, prompts that the browser displays, and tabs.
Some users maybe hate proton tabs because it’s looking like floating button instead of tabs, but you can revert to old tabs with only change value in about:config
Revert Old Tabs via about:config
- Open about:config
- Click Accept the Risk and Continue
- Search
browser.proton.enabled
and set value tofalse
Click to Show Image
- To make more compact search
browser.compactmode.show
and set value totrue
Click to Show Image
- Click on the hamburger menu → More Tools → Customize Toolbar… → Density → Compact (not supported)
Click to Show Image
Sadly, browser.proton.enabled
will be removed in Firefox 90 Stable.
Revert Old Tabs with userChrome.css
- Open about:config
- Search
toolkit.legacyUserProfileCustomizations.stylesheets
and set value totrue
- Open about:support and Click on Open Directory
- Create a new folder named
chrome
- Create a new text file inside the chrome folder named
userChrome.css
(extensions must be CSS not TXT) - Copy and Paste this CSS code to
userChrome.css
and Save it
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- Restart Firefox
- The UI look like this
Click to Show Image
To disable userChrome.css
just set value toolkit.legacyUserProfileCustomizations.stylesheets
to false