Hoping some day someone builds a playground so it's easy to build/customise interfaces through a GUI as I find it a bit of a chore to get things tweaked exactly right!
In the meantime it's worth noting you can use remote debugging[1] to live edit the interface.
- https://github.com/black7375/Firefox-UI-Fix - a good base including different light/dark themes. See Tips for code to put tabs on bottom
- https://github.com/aris-t2/customcssforfx - huge collection of different CSS that you can mix together for the perfectly customised UI
Hoping some day someone builds a playground so it's easy to build/customise interfaces through a GUI as I find it a bit of a chore to get things tweaked exactly right!
In the meantime it's worth noting you can use remote debugging[1] to live edit the interface.
1. https://www.reddit.com/r/FirefoxCSS/comments/73dvty/tutorial...