Looks like we can't reproduce the issue or there's a problem in the test case provided.
Issues with Sencha Map Example in FF & IE
I noticed that when I opened one of the example projects - http://dev.sencha.com/deploy/touch/e...map/index.html in Firefox and IE, the output looks abnormal:
compared to Chrome:
How do I fix this problem if I want to extend the map sample project?
Sencha Touch does not support Firefox. Sencha Touch 2.2 is the first branch to support Internet Explorer 10 also.