At work, certain protocols are blocked, and websites that I visit try to access these protocols with Javascript. These sites work fine when these requests fail (except for whatever it's trying to do with the requests), but I have to click cancel on a multitude of proxy authentication dialogs.

What I want to do is just have firefox silently ignore this, so I can use the website without having to click cancel 8 times on every action I make (this includes all the stack overflow style sites which is trying to make requests with the ws: protocol).