Item — HN Reader

To follow that analogy, it'd be like BMW using an engine from Ford. Their whole selling point is the engines, and how they are different from other manufacturers.

I'm sure there are many backend libraries, parsers, etc. that are used by both Chrome and Firefox, but they're unlikely to replace significant components like that.

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And to keep going...car manufacturers do use engines from other brands, but that's when they are owned by the same company. For example, you'll find Ford engines in Mazdas because Ford owned Mazda (or at least a chunk of it):

https://en.wikipedia.org/wiki/Mazda#Partnership_with_Ford_Mo...

I own a Saab with a Ford engine! It's actually a V-4, two on each side, and it was most widely used to power skidsteers and industrial water pumps and the like. Saab didn't have the engineering capacity to design and launch a engine fast enough to keep up with environmental regulations (having used a two stroke engines up until the 60's!)