Firefox

I don't see how eating their lunch would happen. Something like 85-90% of Mozilla's income every year is from their Google search partnership. Google does some sort of revenue sharing thing where a portion of the value of search ads clicked through Firefox goes back to Mozilla, but the payment for search partnership itself, well, if that goes away, there's no lunch to eat, metaphorically. There's nothing to replace it with. Maybe Bing takes it's place but I'm not sure that would happen.

I think the elephant in the room here is that Mozilla has 0.2% of the revenue that Google has, but is sustaining market share orders of magnitude higher than that. But unfortunately, at this point there's a growing echo chamber of extremely low effort comments assuming that if you could just run back the clock, and not focus on "distractions" like their VPN or Mozilla.social, or the Mr. Robot Easter egg, that they would have overtaken Chrome in market share.

Like it was this easily achievable thing that just slipped through their fingers, rather than an inevitable consequence of Google's disproportionate finances and monopoly power.