Google has been known to trip Mozilla up at interesting times.
For instance, Mozilla spent years on making their browser faster, only for Google to drop the Spectre class of vulnerabilities one day which forced browsers to implement mitigations which hurt performance.
I think that one is a coincidence but Mozilla seems to have no flexibility / adaptability.
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Spectre basically forced multiple processes and Firefox was hideously inefficient with multiple processes to the point of it being a joke.
