A userChrome.css to apply on top of Photon (Firefox 57+) that uses more native OS elements.
Put userChrome.css in a folder called "chrome" in your profile directory. Then restart Firefox and enable the light theme.
Tested on:
- Windows 10
- Windows 7, default theme
- Windows 7, classic theme (the toolbar buttons are just CSS)
- macOS High Sierra
- Recommended to set density to Compact
- There's a set of rules in the .css file you should enable to space the toolbar buttons out more
- Unix+GTK3
- There's a set of rules in the .css file you should enable to make the toolbar buttons smaller