Is there a way to access [Intl.Collator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Collator) in a Firefox add-on built using the SDK?

It’s available on the global window object of ordinary page scripts, but it’s not defined in the global scope of an addon or, apparently, in the window of a [page-mod](https://developer.mozilla.org/en-US/Add-ons/SDK/High-Level_APIs/page-mod). Any other ways to access it? A [page-worker](https://developer.mozilla.org/en-US/Add-ons/SDK/High-Level_APIs/page-worker)? An [XPCOM interface](https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference)?