Rated 5 out of 5 stars
Where did the icons go?
I'm using: Mozilla Thunderbird 86.0b3 (64-bit) and
I am currently working on a version that works better with the beta version of Thunderbird. IF you want to use the current version 5.1 you can toggle browser.tabs.remote.autostart = false, or wait for a patch - for a trial version, see here: