"Open message in tab" is broken! For years I have been using this for emails in my Inbox. It puts a tab for the chosen email next to the Inbox. It's important to me because I want to keep these emails in the front of my attention long term. Now lately, every time I close then reopen Thunderbird, all my email tabs are gone! I know it's not that I moved or deleted the emails because I have verified they were still in my Inbox and put them back up there in tabs multiple times, only to have them disappear again. I also know it's not because I opened a second copy of Thunderbird, because I'm making sure not to do that. But it's acting like it used to when I mistakenly opened Thunderbird twice, with the second one not having the email tabs but the first one keeping them. I think one of the updates wiped this out (in addition to other problems I'll put in different reports). I can see no way to make it work again. Can anyone help? Those email tabs are very important.