Firefox users report high CPU and memory usage in the latest release, caused by browser's on-device AI inferencing for its 'smart tab grouping' feature.
https://www.omgubuntu.co.uk/2025/08/firefox-high-cpu-usage-inference-disable
Mozilla Slammed Over Battery-Draining “Garbage” AI in Firefox
Firefox's new AI tab groups is causing high CPU usage and battery drain. Find out why users are complaining and how to disable the feature.Joey Sneddon (OMG! Ubuntu!)