mozilla firefox search engine not working

clearPref(prefName) – removes the user value of a preference, resetting it to its default value. This function should only be used on preferences that always exist. If the preference doesn’t exist, it displays an error. getPref(prefName) – retrieves the value of a preference. As an example, this would be used in case where a preference should be locked for all users, but unlocked for particular users. unlockPref(prefName) – unlocks a preference. Locking a preference prevents a user from changing it, and in most cases, disables the UI in preferences so it is obvious to the user that the preference has been disabled. lockPref(prefName, value) – sets the default value of a preference and locks it. It can be permanently changed by the user. This is the value that a preference has when the user has not set any value or the user resets the preference. defaultPref(prefName, value) – sets the default value of a preference.

That means that if the user has changed the value, it will get reset every time the browser is started. This function explicitly sets the preference as a user preference.

pref(prefName, value) – sets the user value of a preference. Yes, we use autoconfig-file (in our case: firefox.cfg):

Mozilla firefox search engine not working