Hello, I am sorry you are having trouble with the Mac OSX upgrade. I've had similar trouble. Mount the SuperDuper image using Disk Utility and browse through the contents. Copy desired files over, and then unmount the image. This should restore the files, including the the mail messages. I believe the messages are stored in : ~/Library/Mail/V2
I don't think there is a way to migrate app registration over however. The OSX App Store will have already purchased software (from Apple at least) so you can reinstall from there
Your FireFox addons and extensions should be located in : ~/Library/Application Support/Firefox/Profiles/[profile name]/ so a simple copy should work
To clarify, you should copy from the image's directories into the host OS 10.8.4's directories after you've reinstalled the appropriate applications (Firefox)
Thanks for your time, Matthew.
Unfortunately, I got all this answers before from Internet, I thought you guys as experts would be able to look deeper and forward me toward the fix of the route of the problem.
I have a problem in rating your service: I cannot say it was "bad" or "good" as you answered on time. But I did not get the result I was expecting. You, apparently, tried to help, but it did not resolve my issue with missing data. Maybe I put my answer wrong...
Anyway, I will pay, but really do not think that it cost $58. So, nothing personal, but I will put "OK". At least, I tested your system and should know what to expect in the future if needed.Thank you again for atempt.