That sounds like a bug from within a script you are running. Usually
when the error is in greasemonkey.js its something in a script not
working right although I certainly don't know from here. This is the
firebug related bug I am getting, slightly different, shows up a lot
though.
This one relates to Firebug running (ff 3.5):
Error: [Exception... "Component returned failure code: 0x80004005
(NS_ERROR_FAILURE) [nsIStreamListener.onStartRequest]" nsresult:
"0x80004005 (NS_ERROR_FAILURE)" location: "JS frame ::
file:///...../Profiles/......default/extensions/
fir...@software.joehewitt.com/components/firebug-channel-listener.js
:: anonymous :: line 135" data: no]
Source File:
file:///C:/...../Profiles/........default/extensions/
fir...@software.joehewitt.com/components/firebug-channel-listener.js
Line: 135