I would not usually customize too much my UIs and just try to get used to stuff instead. It's just less friction, and it's nice to be able to install something and be used to the defaults.

Your Firefox UI customization are so good and easy to setup that this is an exception. Thanks for making them. And they feel maintained, which is an important point.

I didn't know you wrote extensively on this, it looks interesting and it looks like it is well documented, I'll be sure to read this. Thanks again!