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Re:HSTS Super Cookies by jjmason on Saturday January 03, 2015 @12:15PM (#8831257)
Wow, can't get it to go away on Firefox 33.0 Ubuntu. I was able to clear it by manually deleting the info from the permissions.sqlite3 database as described by agwa.

Very clever!

Re:HSTS Super Cookies by mtbcoder on Saturday January 03, 2015 @12:40PM (#8831351)
Under History > Clear Recent History, make sure "Site Preferences" is also checked.