This should be the top comment, and I’m going to come back to view the replies. I can’t personally think of any realistic alternatives. Someone further down posted a link to an article about the US investigating Google for a search engine monopoly, but I’m not sure how large a role that would factor into web browsers.
So the lawsuit appears to be looking at Google as a search engine monopoly, not web browser, right? And if I’m understanding this right, assuming this lawsuit goes anywhere, it would actually incentivize Google to pull funding from Firefox to no longer support that search engine exclusivity deal.