To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
CloseReview for StartupMaster by Hiric
Rated 5 out of 5 stars
Currently not working on ThunderBird 52.1.1 but I'm confident it will soon!
You should really open up some account for donations, or, get directly in touch with the dev team to correct this once for all, this is really an embarassing issue!
Kind Regards,
Alessandro Salvati
EDIT: Thank you for your answer! I still don't know why Thunderbird hasn't upgraded yet but your answer definitely fixed my issue :)
Best
You can either use StartupMaster 1.6.2 with Thunderbird 52 or StartupMaster 1.6.3 with Thunderbird 53+. I've marked 1.6.3 as incompatible with Thunderbird 52, I'm not sure why Thunderbird allowed the upgrade in the first place. (You can downgrade to previous versions by following the "Show compete version history" link in the "Version information" accordion.)
To create your own collections, you must have a Mozilla Add-ons account.