When I open it, I get this message: Could not initialize the application's security component [remainder deleted for space - see "details"]
Full error message:
"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."
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This link shows how to deal with this issue - https://support.mozilla.com/kb/Could+not+initialize+the+browser+security+component