Not just Google. There was a performance “bug” in Windows Defender a while back that specifically harmed Firefox. It had been reported but Microsoft took 5+ years to fix.

Now, whether MS were intentionally crippling a competitor’s browser in the beginning when the bug surfaced, there’s no way to know.

But after a certain point, a software company with a market cap in the trillions loses any benefit of doubt I’d give them in scenarios like this where it benefits them not to find a solution. And 5 years is far beyond that point.

Unfortunately for Firefox, they didn’t really have the money for a lawsuit against a juggernaut like Microsoft.