Is there a way to use this as a drop in replacement easily? Like maybe move my Thunderbird profile folder into a Bettterbord folder, or maybe an automatic import option?
This looks promising but I don't really want to set up my email accounts and settings from scratch.
for TB -> TB-flatpack simply pasting from ~/.thunderbird/ to
~/.var/app/org.mozilla.Thunderbird/.thunderbird/
did work for me. I might try betterbird sometime.