I haven't actually been able to find an error in Chrome and Safari yet, so it does seem to be limited to Firefox. However, I will continue to monitor it.
Update: I have now tested it all afternoon and the error only occurred with Firefox. I think that makes it clear that this is a Firefox issue... Can you do something about it, e.g. via a work-a-round?
Update: I have now tested it all afternoon and the error only occurred with Firefox. I think that makes it clear that this is a Firefox issue... Can you do something about it, e.g. via a work-a-round?