FireFox inserting 'stuff' into web addy

[windows]

every once in a while FF will insert a local chrome address into my address field - this is the error: ---Quote--- Firefox can't find the file at *jar:file:///C:/Program Files/Mozilla Firefox/chrome/en-US.jar!/locale/browser-region/region.properties*us.ard.yahoo.com. ---End Quote--- I bolded the...