Firefox Addon SDK: Loading addon file into iframe

Question

I want to load a resource:// link, respectively a local file from my Firefox addon into an iframe in a web page.

The reason is, that the re

Answer 1

I'm using zer0's idea. However, on pages with a content-security-policy I got an exception (...result = 2153644038). For that reason, I add my domain to the content-security-policy of the response header:

//main.js 
var { Cc, Ci } = require('chrome');

var observer = {
    observe : function(aSubject, aTopic, aData) {
      if (aTopic == "http-on-examine-response") {
        aSubject.QueryInterface(Ci.nsIHttpChannel);
        var csp = aSubject.getResponseHeader("content-security-policy");
        if(csp.indexOf('frame-src') > -1) {
            var cspParts = csp.split(';');
            for (var i=0; i -1) {
                    cspParts[i] += ' yourdomain.tld';
                    break;
                }
            }
            aSubject.setResponseHeader("content-security-policy", cspParts.join(';'), false);
        } 
      }
    }
}; 
var observerService = Cc["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService);
observerService.addObserver(observer, "http-on-examine-response", false);

//content-script.js 
iframe.src = yourdomain.tld/...

EDIT: This code might be rejected by a FF reviewer with: "Modifying 'content-security-policy' is not allowed for security reasons."