In the console I see the following error when this happens:
Unsafe JavaScript attempt to access frame with URL https://m.facebook.com/ai.php?aed=AQLaQhnQWooCh1SCclnEbY_lFhGLfUOD_NSo6-3kA…AXJ33Dds2dj1rG7WoDXJANzWSJH4ODGNbkpcQy4TvuOUYrm4zhhpbM9RZshEmupQuQMUsU09ag from frame with URL https://m.facebook.com/. The frame being accessed set 'document.domain' to 'facebook.com', but the frame requesting access did not. Both must set 'document.domain' to the same value to allow access.
In the console I see the following error when this happens:
Unsafe JavaScript attempt to access frame with URL https:/ /m.facebook. com/ai. php?aed= AQLaQhnQWooCh1S CclnEbY_ lFhGLfUOD_ NSo6-3kA…AXJ33Dds2dj1rG 7WoDXJANzWSJH4O DGNbkpcQy4TvuOU Yrm4zhhpbM9RZsh EmupQuQMUsU09ag from frame with URL https:/ /m.facebook. com/. The frame being accessed set 'document.domain' to 'facebook.com', but the frame requesting access did not. Both must set 'document.domain' to the same value to allow access.