@129s thank you for the update. This is not an expected behavior of Cursor and needs to be checked in detail. Please file a separate full bug report when you get this error again. Include there as much info as you can about what you were doing when it happened. Note that there should not be any interaction by default between your browser and Cursor itself.
As this topic is about an older version of Cursor I will close it as such issues need to be analyzed in detail, full bug report or newer thread is preferrable.