I am working on an app that is only used by a few people in-house, so I feel comfortable telling them to only use Firefox or Chrome, so I can use HTML5.
I was workin
input type="number" is not implemented in Firefox yet as of version 25 (November 2013).
Bug 344616 is the relevant ticket in Bugzilla@Mozilla: https://bugzilla.mozilla.org/show_bug.cgi?id=344616
Update 10 March 2014 - Good news! Looks like the ticket was fixed in Firefox 29, scheduled for release on 29 April 2014.
Update 30 April 2014 - Confirmed, I just gave it a try, and Firefox 29 has support for input type="number".