Excellent !! 12 on a scale of 1 - 10.
It's seems to me most folks will just stick with whatever search engines their browser provides. And I'll bet that Mozilla doesn't want us to manage our search engines like this, because of the money involved.
"The bulk of the $520 million in revenue for the Mozilla Foundation came from royalty payments, with most of that coming, as usual, from deals struck for the default search engine spot in Firefox."