If you are like me and have been in the industry for a while, you may be getting to a point that you need to change font sizes in order to avoid using glasses, or adapt to the size of your display of the day!
I have been struggling with that for years and I have used the recommendations found in the Mozilla sites to modify the UserChrome.css files to adjust font size, but this article here: Bad Eyesight - Thuderbird helped me to find the final solution, just an add on that can be used on Thunderbird or Firefox! Theme Font & Size Changer add on! For Thunderbird, just download the add on and then drag and drop that file on Thunderbird Add On page (go to Tools - AddOn). This will add an a Theme Font & Size Change on the Tools menu and there you can adjust your font sizes!
