I lost all my passwords from the previous version of Firefox when I upgraded to Firefox 4. I have all the files. Is there any way to import them into Firefox 4?

Typically, when I have upgraded a program, all of the bookmarks, passwords, etc. have transferred to the newest version but, for some reason that did not happen with Firefox 4. I still have all my preferences files as they were moved to the trash. Is there any way I can import them back into the new version of Firefox as it is very frustrating to have lost them.

If you used the option to delete settings, or whatever it is worded when uninstalling, Firefox will remove all your important data information from profiles for all installed versions of Firefox, and you will then need luck and a file recovery utility to try to restore the information.
You mentioned files being moved to Trash, I was hoping you may still have the required original files. I use Windows XP, and I realise Macs use different locations for files, but I think the files have the same names.
See
*[[profiles]]
*http://kb.mozillazine.org/Password_Manager
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Recovering_a_missing_profile
*[[lost bookmarks]]
Note the last article discusses problems when bookmarks are lost, and some of the possible reasons and solutions. Obviously I do not know what has actually happened in your case, and whether or not you used the delete option I initially mentioned.

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