Firefox的問題

我一打開firefox, 就會出現以下message, 重裝firefox仍然不行，請問是怎麽回事。
"Could not initialize the application's security component. The most likely cause is problems with files in your application's profile directory. Please check that this directory has no read/write restrictions and your hard disk is not full or close to full. It is recommended that you exit the application and fix the problem. If you continue to use this session, you might see incorrect application behaviour when accessing security features."