During the google money years the ROI on Firefox was so mind-bogglingly high it would’ve been insanity to drop it all into the browser: It couldn’t possibly have soaked up the sheer amount of resources.

Meanwhile, yes they did sink a large amount of resources into it in a way a profit-driven company never would have: They designed a whole fucking new programming language to get proper concurrency into the thing. Rust is, in a very real way, a language to write browsers in. That’s its purpose. And then they set the language free because, among other things, you can’t make money with it.

Sure, lots of those investments tanked. But OTOH you have stuff like pocket which makes money and could probably keep the lights on by itself. If everything but pocket were to fail Mozilla absolutely would have to downsize, would definitely have to scale back its charity spending, rely more on the FLOSS community to actually write code, but it’d continue with the same kind of force as say Blender, which wouldn’t be what it is without its paid staff (both coders and artists) and sidle-hustles (commercial support, training, and cloud services, mostly. Oh, t-shirts and mugs. Don’t forget t-shirts and mugs).

I guess overall the gripe I have with the “Mozilla should invest more in Firefox” chorus is that it implies “Do you want Mozilla to be way smaller and less capable of shaping the web than it currently is”. People have no sense of the scale of Mozilla, think that it’s running on donations etc.