I checked the wrong box on for a website I use frequently and now recieve the message "Access to xpcom is denied. Set "signed.applets.codebase_principal_support=true" in about:config"; how can I change this?

I am tech challenged. I know this is probably a setting that just needs to be changed but I have idea on how or where to go to change it. It appears to be a security setting - I checked the wrong box on a firefox popup regarding access. The site is grammarly.com and when I attempt to paste my copy to be grammar checked it won't allow me to do so, and I get the above quoted message. Please help!

You can check the file prefs.js in the profile folder to see if you find any lines referring to that website and remove those capability.principal.codebase lines.
*http://kb.mozillazine.org/prefs.js_file
*http://kb.mozillazine.org/Profile_folder_-_Firefox
Help > Troubleshooting Information > Profile Directory: Open Containing Folder

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