Review for Theme Font & Size Changer for ThunderBird by KCNewsie
Rated 4 out of 5 stars
Still trying to get this fixed on my MacBook, running El Capitan 10.11.6. First few tries using HappyOne's link didn't seem to do it. Anybody have step by step assistance for a Mac installation? Thunderbird version 52.5.0.
AHA! Never mind. Got it. Thanks HappyOne.
To create your own collections, you must have a Mozilla Add-ons account.