I used to use the Account Colours add-on for Thuderbird, which makes it easy to see the various accounts that emails are received via. Other email clients support this sort of feature as standard. V78 has broken the add-on and the developer is no longer going to update it - and I can certainly understand why. I can't find any settings in Thunderbird itself that would do this - have I missed anything? I have to confess that I don't like the new look and will revert to v68 until things improve.