userchromecss topic
FirefoxCSS
Custom firefox interface
firefox-vertical-tweaks
Firefox-UI Tweaks extending the 'Tree Style Tab'-Addon for optimized vertical page size
Edge-Mimicry-Tree-Style-Tab-For-Firefox
A theme for Tree Style Tab that tries to replicate the vertical tab feature of Microsoft Edge Browser
elementaryos-thunderbird-theme
This theme blends Thunderbird into the elementary OS user interface.
Shina-Fox
A Minimal, Cozy, Vertical Optimized Firefox Theme
GlassFox
// transluscent firefoxcss theme
InfernalFox
A minimal FirefoxCSS
ShyFox
A very shy little theme that hides the entire browser interface in the window border
Minimal-Arc
Minimal Firefox CSS theme with Arc like design with vertical tabs
firefox-config
Personal Firefox Browser Configuration