Firefox cannot modify the needed file. I get this message when I try to add a theme. I am using Linux Mint 14.

I am currently using Linux Mint 14 with Firefox 21. I am trying to add new themes and add ons, but I keep getting the message "firefox cannot modify the needed file in linux". How can I correct this?
Thanks

Click the Firefox button at the top left, then click the ''Help'' menu and select ''Troubleshooting Information'' from the submenu. If you don't have a Firefox button, click the Help menu at the top and select ''Troubleshooting Information'' from the menu. Go to Open Profile Directory (or something similar) and delete a file named user.js

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    -----

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