The Color Folders add-on was one of my favorite add-ons and worked in Thunderbird 60.0. Now, with the release of 60.3.0, it is now automatically disabled with the message: "... incompatible with Thunderbird 60.3.0" If I had known this would happen I would not have upgraded. What was changed and why? I could not find a substitute add-on. Why doesn't T'bird publish a list of add-ons that won't work after an upgrade? I did not see anything so critical about the actual update and could have lived without it. I also don't know why there were so many gui design changes. They were not necessary and, IMHO, made the gui less attractive. Are such changes evaluated in beta releases? Thanks to any and all who have answers to these.