You can also install a new search engine plugin / search provider from the Mycroft Project: http://mycroft.mozdev.org/search-engines.html?name=google+ssl

Exactly! Adding a lousy book to the library doesn't ruin the library. With a novel though, adding a lousy chapter does affect the book. I say novel because u read a novel in its entirety. If it were a reference manual however it is more like a library than a book in that it is a collection of things independent of (though related to) each other and as such no one part 'ruins' the whole as the whole is in a sense irrelevant.