If Google stopped supporting Firefox today, Bing would still pay to be the default engine. If bing does not pay, Yandex would do.
My point here is Firefox still has 2.71% market share, a lot of search engines operators would pay Firefox good money to be their default engine.
The default search revenue stream is guaranteed as long as they have good amount of users.
But they actively choose to ruin it.
You said Mozilla couldn’t purchase a search engine by implying they didn’t have enough free money, so I gave you an example of them spending $65 million. I just thought to myself, “isn’t it interesting that they missed an opportunity to directly monetize something,” and I shared it with you.