Googles been the default engine since the Netscape Websuite days. I don't always love what Mozilla does with their browser, but they do an excellent job of balancing "the web should be easy to use," "the web should be humane," and "the web should be what you want it to be."

If you want to say Mozilla sucks, that's fine, go ahead, just be ready for that any other browser Dev group is either worse or dependent on being downstream of Firefox to do what they do