I accidentally upgraded from Thunderbird 68 with Enigmail to Thunderbird 78.7.1. I use Inline-PGP because a recipient had problems reading PGP/MIME, requiring manual decrypt. Now, only PGP/MIME is supported. How can I add back Inline-PGP support? I found a related bug in bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1602481 It's marked as low priority. There are other problems with PGP support compared to Enigmail, like PGP key password protection, encrypted subject (now fixable in the config editor), per-recipient automatic encryption rules, and popup dialog confirmation box when sending encrypted or unencrypted mail. Those, I can deal with. Not having Inline-PGP is a blocking issue for me. I don't have a recent profile backup and downgrading Thunderbird is not supported.