Using the browser Firefox when Claude is answering questions every 3-4 responses will hang and the response will consume up to 98% of the cpu as well as 600 to 700 MB of memory. The only recovery is to kill the tab. The CPU is : Intel(R) Core(TM) Ultra 9 185H 3.10 GHz With 64GB ram Using Firefox version 139.0.1 I had Claude switch to only respond with plain text and the issue continued. The issue also occurred during a discussion with Claude about this issue which confirmed it was a Firefox-specific problem with Claude's interface. It during his response, it's likely related to the real-time text streaming or DOM updates.