Router initialisation with / adds a history entry in FF

[Anthony Sennett]

Using this to initialise a router:

var router = new Router();
router.init('/');

This appends #/ to the URL.

Loading a page with this script in a new tab with Chrome does not generate a new entry in the history (expected IMO). The back button goes to the new tab page.

But doing in with Firefox 37.0.2 creates a new history entry, and I have to press back twice to get back to the new tab page.

I reproduced here: http://output.jsbin.com/tejahudike/2 (editable here: http://jsbin.com/tejahudike/2/edit).

Formal reproduction:

1. Open a new tab in FF
2. Load URL http://output.jsbin.com/tejahudike/2
3. Press the back button
   • expected: firefox goes back to previous page - "we are on the page" is not visible - this is the behaviour in Chome
   • actual: firefox goes back to the same page (removes # URL frangment)