How to change Mozilla.cfg to set google as default search engine

Need help with our setting mozilla.cfg file to change the default to yahoo search engine to google.
Browser.search.defaultenginename in comments: config already has the default value of 'google', so doesn't justing adding this line of modzilla.cfg - ' pref ("browser.search.defaultenginename", "google", as its currently by default.)

I noticed that if I manually change the search provider (thru the interface), then this value changes from 'default' to 'user set', which retains google as the default search engine. So how do I either set this value as 'user set' within mozilla.cfg, or use some alternative?

thxs

You can restore the change in Google Yahoo search engine in the Firefox 34.0.5 by enabling / disabling browser.search.isUS to false.
Note that only 34.0.5 replaces the default search by Yahoo! engine.

//
lockPref("browser.search.isUS", false);

See also these prefs:

Tags: Firefox

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