i sometimes get these messages in chrome's console:
Couldn't access frameId in BuildFramenfo; skipping frame
Hearbeat state not found
The two messages are repeated a few times.
Sometimes (not always!) they are followed by a
Attempted to use a disconnected port object
and the browser stops reacting.
I cannot really reproduce the problem but it looks like it happens when i change the page
(navigate to a new url).
What is it and is there anything I can do to avoid it?