Some sites (notably Google ones) are notorious for implementing anti-competitive behavior, where if their website is visited other than a chromium based browser, it slows down or a functionality stops working.

I assume you're referring to Google meet (and the screen blur functionally), this is an open issue in Firefox for years, Google is using open standards to implement that, it's an issue in Firefox with how deadlocks work which is an extremely low level part of the browser. So it's not an easy solve.

There's a lot to complain about with Google, but this one isn't their fault. They use non-proprietary implementations and it's not their fault that Firefox will crash if they allowed Firefox users to use screen blur, the issue isn't a high priority for Mozilla.