I'm having the same issue. All tabs froze and the FF energy demand spiked. I upgraded manually from 95.0.2 to 96.0 but the issue persisted.

Twitter[1] is currently lighting up with broken FF reports across the globe.

Some people are reporting that if you hold down Shift while opening it works (though any FF personalisation is wiped). That didn't work for me on Mac.

[1]: https://twitter.com/search?f=live&q=firefox%20until%3A2022-0...