I'm struggling to connect how Google's last major browser engine competitor potentially losing it's funding due to a separate monopoly issue is similar to laws being passed to reduce death and hospitalizations.
FOF ¶ 334. Google’s default placements on Firefox generate 80% of Mozilla’s overall operating revenue, demonstrating that the vast majority of query volume on Firefox goes through defaults.
The DOJ is concerned with moving the needle on one specific issue (search monopoly a.k.a. seatbelts) and is not concerned about the side effects on related entities (Firefox a.k.a. undertakers).
The analogy is: Sometimes the one negative outcome (Mozilla & hospitals losing money) is a price well paid for another positive one (regulating monopolies & reduced deaths).