## The problem
Issue mixpanel/mixpanel-js#502 (closed, 6 comments): We have received multiple user reports indicating that our application becomes unresponsive on certain pages. After a thorough investigation by our engineering team, we have reason to believe this issue may be caused by a conflict between the mixpanel-browser SDK and certain browser extensions. To mitigate the issue, we have temporarily disabled the start_session_recording method. However, we suspect the root cause may be deeper and would appreciate your assistance in further debugging. How to Reproduce: 1. Install the Screenshot & Screen Recorder Tool extension from the Chrome Web Store 2.

## What fixed it
[jakewski (collaborator)]: The docs-site unresponsiveness was an rrweb infinite loop (markCssSplits) triggered by DOM-mutating Chrome extensions. Mixpanel forked rrweb to pull in the fix and released it; reports stopped after the release.