thunderbird --ProfileManager

[William]

I was running Thunderbird-68.12.0 and Firefox-68.12.0esr.  As you can imagine, lots of website don't work properly, for me, company payroll site, income tax site, old school email, and others.  So, I finally decided to bite the bullet and upgrade.

Main problem I encountered was Firefox and Thunderbird didn't use my old data.  I have shit loads of account settings, filter rules, and emails.  After many 4 letter words, I managed to figure out how to configure Firefox and Thunderbird to use my old profiles.

Code Select Expand

thunderbird --ProfileManager
firefox --ProfileManager

[Jason]

Great tip, William! Thanks.