I am recovering my thunderbird browser after reinstalling it. Before the reinstall, thunderbird was full of the apps currently in my firefox "M Gmail", but the reinstall left thunderbird empty. I have entered the folder names from "M Gmail" into thunderbird, but I can't seem to copy the "M Gmail" folder contents to thunderbird. During my ~3 week absence from gmail, several users have emailed me suggestions as to how to get back on the internet; I will answer them in time, but I'd rather send them thunderbird emails. How can I copy files from "M Gmail" to thunderbird? I am at [edited] @gmail.com .