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When I try to export my digital certificate (make a backup copy), firefox says that backup PKCS # 12 could not be done due to unknown causes.
I obtained new digital certificate, which is working without any problems. When I try to export backup copy of new or already existing certificate, I get response window that exportation failed due to unknown reason. I use Firefox 3.6.14
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The same problem occured with FF in Linux. The solution found there was to uninstall Torbutton, restart FF and try again. In my case I had to try twice. There may of course be other plugins that cause problems ...
I solved the problem by using MozBackup. I backuped certificate and then exported it to other computer.