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I want to make a local back-up not only of my local Thunderbird folders, but also on the on-line folders. I am using IMAP and as far as I get, using the "export options", you only back-up data in the local folder. How do I ensure that I get a local copy of also the on-line inbox (and all of its sub folders)

Have to keep pressing keys periodically when streaming video in a Firefox tab to prevent the screen going dark. The Ubuntu Mate Power Management settings have all been configured to prevent the System from doing so, so I'm wondering if this has something to do with Firefox. As a caregiver for a disabled person otherwise without television access I would find this very helpful.

In my Thunderbird I have some folders with names printed italic starting with "INBOX". The folders are empty, so it's easy to delete them. After deleting I don't see the folders anymore. But after shutting down Thunderbird and starting Thunderbird again, the folders are back... How do I delete the folders to not see them anymore?? (see also attached screen print)

Best regards, Marianne