Oneliner with Sidebery by

Firefox CSS theme with oneline and vertical tabs sidebar based on Sidebery.

Required

• Firefox/Librewolf

Optional

• Sidebery

Usage

• Go to about:config in your Firefox and set the value of toolkit.legacyUserProfileCustomizations.stylesheets to true.
• Download userChrome.css from /chrome.
• Go to about:profiles in Firefox and open your Profile Folder by selecting root directory
• Add to Firefox user profile folder under /chrome downloaded userChrome.css.

Optional

• Install Sidebery addon in Firefox from Firefox Addon Store.
• Download sidebery.json and load sidebery.json it in Sidebery settings.

Credits

MrOtherGuy for his amazing firefox css sidebar autoclose hack -
zayihu -
freeplay - https://freeplay.floof.company/