Yesterday I updated Thunderbird to version 52.7.0 (32 bit) and upon opening it this morning, all the fonts in the panel had gone to their tiny original size. This is so frustrating. The add-on: Theme Font and Size Changer Thunderbird is still there but it is no longer under the Tools menu where it used to be. I have uninstalled and reinstalled the add-on and zilch; no change. There is nothing under Tools to enable me to change the font size. I am not referring to the font size of the messages, but the folder panel where I see all my emails. What is the workaround to bring this add-on back in a working condition or any other solutions? I would need to wear a magnifier in order to use Thunderbird at this rate. Please help :) Thank you.