I was trying to import my old profile from a linux computer into a new download of Thunderbird on a Mac. Somehow I deleted the new profile rqlrq3y3.default from the Mac and Thunderbird won't open - error message "Thunderbird profile cannot be loaded". I used troubleshooting and sure enough the profile is blank. I thought I could fix the problem deleting Thunderbird from the Mac and downloading it again. The same error message comes up. How can I reenter the new profile name into Thunderbird on the Mac? Thunderbird won't open on the Mac so I can't create a new profile. Or, what else can I do to fix repair the lost new profile? Thanks for any suggestion.