Theme Font & Size Changer Issue

I wanted this Thunderbird add-on so that I could enlarge the font size in the toolbars and side panel. It does that nicely.

Unfortunately, it also cuts off the bottom of many dropdown menus. For example, I find that enlarging the above fonts by 120% works well for me. But, if I want to “Import” a file, this add-on cuts off the bottom of the action window. So, one can’t see the “Next” button to continue. You’re frozen there and have to restart Thunderbird to undo the damage.

Have you tried contacting the author of the add-on for help?

Not yet, wanted to be sure my question had not already been answered. Now that I know it has not, I will do so.