Então o github usa o módulo PJAX do "defunkt" (https://github.com/defunkt/jquery-pjax#events), e eu estou criando um addon do firefox que precisa ouvir o evento pjax: end

Até agora eu posso fazer isso com jquery assim:

$(document).on('pjax:end', function (t) {
   console.log('pjax:end');
})

no entanto, como faço isso com funções javascript padrão?

document.addEventListener('pjax:end',function(){
     console.log('ya');
}, true);

não funciona.

para quem conhece o add-ons do firefox, este código de código não funciona:

gBrowser.contentWindow.wrappedJSObject['
lança este erro:
/*
Exception: Permission denied to access property 'guid'
te.event.add@https://github.global.ssl.fastly.net/assets/frameworks-752c70f2b89dcf2d1f948637afa35a3285fe6424.js:2
e.event.add@https://github.global.ssl.fastly.net/assets/frameworks-752c70f2b89dcf2d1f948637afa35a3285fe6424.js:3
.on/<@https://github.global.ssl.fastly.net/assets/frameworks-752c70f2b89dcf2d1f948637afa35a3285fe6424.js:2
.each@https://github.global.ssl.fastly.net/assets/frameworks-752c70f2b89dcf2d1f948637afa35a3285fe6424.js:1
te.prototype.each@https://github.global.ssl.fastly.net/assets/frameworks-752c70f2b89dcf2d1f948637afa35a3285fe6424.js:1
.on@https://github.global.ssl.fastly.net/assets/frameworks-752c70f2b89dcf2d1f948637afa35a3285fe6424.js:2
@Scratchpad/2:1
*/
](gBrowser.contentDocument).on('pjax:end', function (t) {
    Cu.reportError('pjax:end');
})

lança este erro:

/*
Exception: Permission denied to access property 'guid'
te.event.add@https://github.global.ssl.fastly.net/assets/frameworks-752c70f2b89dcf2d1f948637afa35a3285fe6424.js:2
e.event.add@https://github.global.ssl.fastly.net/assets/frameworks-752c70f2b89dcf2d1f948637afa35a3285fe6424.js:3
.on/<@https://github.global.ssl.fastly.net/assets/frameworks-752c70f2b89dcf2d1f948637afa35a3285fe6424.js:2
.each@https://github.global.ssl.fastly.net/assets/frameworks-752c70f2b89dcf2d1f948637afa35a3285fe6424.js:1
te.prototype.each@https://github.global.ssl.fastly.net/assets/frameworks-752c70f2b89dcf2d1f948637afa35a3285fe6424.js:1
.on@https://github.global.ssl.fastly.net/assets/frameworks-752c70f2b89dcf2d1f948637afa35a3285fe6424.js:2
@Scratchpad/2:1
*/