Hello Alug
I made enquiries to the list some time ago about exporting emails from Firefox to a folder on a separate drive. I received several replies after which I downloaded an add-on and could export emails successfully.
One responder was James (don't know any other details) who said he exported regularly from Firefox; I'm wondering if he (or anyone else) could comment on how well the Folder & Subfolder Structure copies, or the method they use. I find I often have to make separate folder on the target drive, then copy the emails into this, then it works well.
Thanks