Need to be able to display pending and errored ajax requests

Hi there,

I’ve been trying to create a google chrome extension which could show (on page) the number of pending and errored requests made.
I originally was looking into the API however that’s only available within the devtools window itself.
Also was looking at the webRequest API but have been failing to get that working.

I am currently looking into monkeypatching XMLHttpRequest but when I try I just get an ‘Illegal Invocation’ error.
Example of what I’m trying to do below:

var fn =; = function(a,b,c){

I also need to be able to deduct from the pending requests counter when they finish but for the moment I’m just trying to initially count pending and errored.

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