The worst bug in Thunderbird that I've seen in years: my opened tabs are replaced with random ones after a reboot. Imagine this: I save a lot of emails in tabs, and I can do that for weeks at a time, since I don't reboot my laptop (only when there is a kernel update). I want these emails. I need them. Then I reboot my computer and all of them are replaced with random emails....this is awful. Happened after that fancy Thunderbird update with the fancy new UI.

Reported it here bugzilla.mozilla.org/show_bug.…