- reduce tabs to single favicon (remove labels and close icons)
- gray-out unloaded tabs
- reduce spacing around toolbar buttons
- reduce spacing between elements on about:config
- less blurry images on 4k screen
- increase search box size
- less ui animations
- hide flow-breaking spacer on the menubar
- make "flexible space" from customize menu to fill entire space
sudo mkdir -p /etc/portage/patches/www-client/firefox
sudo cp tabs.patch /etc/portage/patches/www-client/firefox
emerge -1 firefox