Must be my age (79) but I find that I often miss emails marked important which only changes the color of the text, I would be much happier if the background could be changed.
Is there an add-on that can do that?
Greetings @hershy. I am not aware of any such extension.
Thanks for posting. But you should know that discourse, where you have posted, has very little traffic. Most of our posting help occurs at Log In / Sign up | Mozilla Support where you are more likely to get assistance.