Firefox-vertical-tabs-customUI
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Custom userChrome and userContent.css for Firefox. Including vertical tabs(tree_style_tabs), full dark mode, thin title-bar text in nav-bar and much more.
Normal mode
Compact mode
-Tabs expand on hover.
Works best in Photon UI. Not tested with proton UI changes, but it is compatible.
Dark theme used - Light/dark grey & orange theme. Available from the Firefox add-ons store. UI may not be displayed correctly with other themes.
Tree style tabs extenstion required.
How to add stylesheets: https://winaero.com/enable-loading-userchrome-css-usercontent-css-firefox/
Put userChrome.css, userContent.css and newtabbgimg folder in the chrome folder of current active profile root folder. Put user.js in the current active profile root folder.
Copy the code in TST_advanced_section.css and paste it in the advanced section textbox of tree style tabs settings page.