Big trouble with "The application 'Firefox' can't be opened

Hello
I have a big problem. I cannot use firefox, either quit it or use this application. If I want use firefox than I get the Information "The Application firefox can't be opened -600". And also I cannot close my macbook Pro (alas it is a Retina) or trying reboot. It still stands and nothing changing on the desktop from the macbook. I have red some some problems with the probably solutions how can fix it, but I'm afraid about, that I would make a big mistake and destroy the macintosh Marverics System that I have.
Please. I need help !
Thank you!
Canno92

This Step failed a lots of time. I tried everything in my mind. I tried to do this step you suggest me now, and nothing (some tries before) happened. What can I do to not have the message "the application firefox cannot be opened - 600" ? Its really **** that that happened now..
I tried to reboot - nothing changed
I tried quit the application - nothing changed
I tried to hold he "shut down" button - nothing has changed or has shut down
I tried go to system preferences/application/ and tried to trash the application - nothing changed, because the application is still working/or in use. And this s*** is really confusing me. Therefore I can not use firefox, not trash the application because it is in use, or either close the application to shut down or restart/reboot my macbook Pro.
Any other suggestions? If possible, than it would be very kindly.

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