Please see the MacOSXhints page for the details. When using Apple's Migration Assistant to migrate machines and create a new user, there will be problems with the Firefox Downloads folder. Apple's Migration Assistant uses the path for the old account and then Firefox will not be able to save downloads because of problems in permissions. "The solution is to open ~/Library » Preferences » com.apple.internetconfig.plist with the Property List Editor (Xcode required), navigate to the Download Folder item, and delete the value (not the key; just the value under it), then save the property list file. The next time you save a downloaded file in Firefox, OS X will ask you where you want it. Answer the question, and the problem goes away permanently."
I realize this may be more of an Apple Migration Assistant problem than a Firefox problem but we need to address this somehow.
Component: General → OS Integration
QA Contact: general → os.integration
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