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as I stated below, I have Ubuntu 15.4, using latest TB v.38.3. I was able to export my emails to Dropbox using this add-on when I had earlier version of Windows 8.1 and TB 37, but hate Windows now (no privacy) migrating to Linux as are a few other thousand people.
I can open single emails at-a-time within Dropbox folder for TB, but I have thousands of emails and not going to spend time opening each email to discover or guess header source.
Why TB and FF got rid of this useful, necessary functioning tool is beyond me--ESPECIALLY when one has to change or upgrade to new computers or software. Unbelievable.