Google's dominance is so complete that for years even their top browser competitor, Firefox, came preset to use an omnibox with Google as the default search engine, meaning that everything one typed into the browser was sent to Google, even if not actually a Google search.

This integration with Google is pervasive in Firefox; there are dozens of settings built into the browser that send information to various Google services. Yes, it's possible to change all of them, but probably less than 0.001% of users will do that. This is why it's not possible to take Firefox's claim that they are pro-privacy seriously.