How to hide FireFox tabs to use Sidebery How to hide the FireFox native tabs so that the Sidebery vertical tabs add-on will be the only thing displaying tabs
These instructions detail how to create/edit a userChrome.css file for Firefox which hides the native tabs so that the Sidebery vertical tabs add-on will be the only thing displaying tabs.
Note: - These instructions work if native tabs are set to be HORIZONTAL in Firefox.
- This was written on 2025-07-19 and tested on Firefox 140.0.4