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"WARNING: An error occured while fulfilling user request" in Firefox #981
happens in release: 20160618 and 20160515
I'm following the guide on FitNesse website. Starting FitNesse for the first time:
After opening the home page (http://localhost:8080/) I get the following periodically:
This is what I see when I open the page in Firefox 48.0. When I open the page in Chrome 52.0.2743.116 (64-bit) I don't get any warning.
It seems that it gets triggered by hovering over the top menu buttons (Edit, Add, Tools) but I cannot see any network traffic in the developer tools of either browser. However, wireshark shows
In release 20151230 the behaviour is similar (no warnings when opening in Chrome) but the content of the message is:
Does this result in functional errors in the application?
I've seen an issue on this subject before. After investigation, it appeared Firefox was opening connections, but not sending any data.
There is a related issue, although I can not find it right now.
Probably related to this but I haven't been able to narrow it down to an actual cause: