Many Linux users have recently reported their fans running at full speed and high temperatures. They discovered that Firefox was consuming all CPU cores, and it turns out that the cause was Firefox's new default AI features. This is how you ruin your product https://www.theregister.com/2025/08/13/firefox_ai_scoffing_power/

The Register
Some users report their Firefox browser is scoffing CPU power: You guessed it: looks like it's a so-called AI