Confusing just at a first glance, but I didn't read any instructions yet.
IMPORTANT and helpful. I have had an unfixable problem with the icons for my addons showing up. Somehow, this addon fixed it! So I'm thrilled that I added it. Even after disabling and restoring my original theme, the problem stayed fixed. It would be really helpful if a developer could check on what this addon changed to fix that problem. I will check my about:config setting it to show only changed values.
I will be using this addon as soon as I have time to read all of the documentation.