I get a pop up warning that says can't read application.ini an firefox won't open

I've been using firefox browers for a while an never had any problems. Till know. The problems is it won't open.
It can't find or read the application.ini file
I don't know anything about this.
Thk u.

Download a fresh copy of Firefox ( http://www.mozilla.com/firefox/all.html ) and do a reinstall of Firefox on top of the current version.
If that still causes the same problem then do a clean reinstall and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.<br />
Don't remove personal data when uninstalling.<br />
It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.

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