DESCRIPTION: Some vulnerabilities have been reported in Mozilla Firefox, which can be exploited by malicious people to bypass certain security restrictions, disclose sensitive information, conduct cross-site scripting attacks, or potentially compromise a user's system.
2) An error when processing the "persist" XUL attribute can be exploited to bypass cookie settings and uniquely identify a user in subsequent browsing sessions.
For more information see vulnerabilities #4 through #10 in: SA33184
The vulnerabilities are reported in versions prior to 3.0.5.
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I'd try a freezer safe zip lock bag. Try to get as much of the air out as you possibly can as even the air moisture in the bag itself could be an issue if it condenses in/on the drive. You might even try the fridge first.