Very nicely done. A lot of customization, and no permissions needed. Thank you.

EDIT (12/11/2021) - Not sure what is happening, but when I cold start Firefox each day the default settings take place. I import my settings I saved, and all is good for the day even if I close Firefox, but each day I have to do the same thing. I've uninstalled it, and reinstalled it, but it still reverts to default settings each day for the first cold start.