My work internet connection runs behind a proxy with pretty standard filtering to keep us away from watching silly videos on youtube all day. I'm running Firefox 11 on Windows and it is configured to automatically use the system network proxy settings.
Lately I've been getting "Authentication Required" proxy dialogs from the browser whenever a page on Stack Overflow, Meta SO, Server Fault, etc loads. The page content itself displays, but then some sort of active content on the page fires and needs proxy authentication. Inputting credentials does not make this go away. It started of with one or two dialogs per load about a month ago, went down to none on SO last week, and as of today is up to 6-8 requests.
Based on the Similar Questions, it appears to be something to do with WebSockets. I have tried entering both accurate credentials and bogus credentials as suggested in other questions, to no avail.
These dialogs make for a brutal browsing experience to the point that I'm unlikely to visit the site for actual work problems. The issue only seems to affect Firefox. No troubles with Chrome or IE7. Can this be fixed? Is there some way I can turn off the active content for myself?