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[x] bug report
[ ] feature request
[ ] support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior
FireFox Only The date pipe is producing the string incorrectly when using a custom formatting mask.

I'm aware of the fact that there are support problems with the Intl api on Firefox, but want to get this in your backlog.

Expected/desired behavior
The date string should be produced as per the formatting string.

Reproduction of the problem
If the current behavior is a bug or you can illustrate your feature request better with an example, please provide the steps to reproduce and if possible a minimal demo of the problem via https://plnkr.co or similar (you can use this template as a starting point: http://plnkr.co/edit/tpl:AvJOMERrnz94ekVua0u5).
Unfortunately, I couldn't reproduce this in plunkr, but if I set a breakpoint in my code and ran the following it produces the error:

datePipe.transform(new Date(), "MM/dd/y");
#   =>  "8/4/2016/8/4/2016/8/4/2016"

We see this behavior in a child component that is created from a page via the <router-outlet>.

One additional thing to note, is that using 'shortDate' as the format seems to work in FF. But if we feed a custom format in there, the error occurs.

What is the expected behavior?

I would expect the following code to produce:

datePipe.transform(new Date(), "MM/dd/y");
#   =>  "08/04/2016"

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

• Angular version: 2.0.0-rc.4
• Browser: [all | Chrome XX | Firefox 45.2.0 | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]
• Language: [all | TypeScript 1.8 | ES6/7 | ES5]