Rated 5 out of 5 stars
Great addon! The only question is font size 14 or 8 shows no difference in my composing window, but it does show correct sizes in the preview window and actual email received. Is that a program bug or problem with Thunderbird or perhaps my computer screen resolution? My screen resolution is 1920 x 1080.
Might be some odd minimum font size setting messing with how the message is displayed in the compose window.