So far it only occured on firefox, i also use chrome sometimes but there it does not happen.
Besides noscript, which i only use on firefox both browsers also have the same addons (on noscript i allow trackbase.net and tbstatic.net, only ajax.googleapis.com and google-analytics.com are forbidden, so that shouldn't be the problem either).
I'll try to remember making a console screenshot the next time when it happens, but as it doesn't happen everytime this might take a few days.

Greetings,