type in the URL bar 'about:config' and find (just type 'ulten' in the search bar)
browser.search.defaultenginename
should say 'default' then 'string' then 'Google'
Easy? :P
For your information, it can't change all of a sudden - you agreed to allow something to change it. You installed something that's not good, or you just don't read when you click stuff. This happens a lot with Windows (R) crapware.Firefox default search engine changed to Yahoo all of a sudden?Doh!
Then you must have some malware in your system, because this is exactly where Firefox gets the information that tells it which default search to use!
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Firefox default search engine changed to Yahoo all of a sudden?If you use AVG anti-virus it automatically changes as AVG and Yahoo are affiliated, you may have to change the AVG settings as well.