page-worker-x-domain-iframes example no longer works

[oliyh]

Hi,

After converting package.json to work with jpm (new version attached) I get the following error from the example.

I was trying this example because I was attempting similar functionality in an add-on that I am working on and it led me to suspect that the permissions/cross-domain-content key was being ignored in Firefox 40+.

I found that this example fails in the same way, i.e. an iframe with a src that is explicitly allowed as per the package.json entry does not load, and iframe.contentDocument is null (or not allowed).

Is it possible to update the example to work, so I can see how it should work, or is it a bug in Firefox that needs fixing?

Thanks

Error

page-worker-x-domain-iframes:Error: Permission denied to access property "document"
Stack trace:
@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/loader/sandbox.js -> resource://jid1-znbofqt8hrykrq-at-jetpack/data/page-script.js:3:5

package.json updated for jpm

{
   "name": "page-worker-x-domain-iframes",
   "title": "page-worker-x-domain-iframes",
   "id": "jid1-ZNBOfQt8HRykrQ@jetpack",
   "description": "a basic add-on",
   "author": "",
   "license": "MPL 2.0",
   "version": "0.1.0",
   "main": "lib/main.js",
   "permissions": {
      "cross-domain-content": ["http://en.m.wikipedia.org/"]
   }
}

[oliyh]

Steps to reproduce:

1. Clone this repository
2. Run jpm xpi on this subproject
3. Install resulting xpi file in Firefox
4. Open addon debugger for this addon and view console to see errors