"The Reload / Refresh Icon Is Not Reproduced Correctly" Rated 4 out of 5 stars
I've already pointed out that bug to David ( https://addons.mozilla.org/en-US/firefox/addon/noia-fox/reviews/user:2675038 )
He replied that he could not see that issue on his system - looks like he needs to work on that, though. ( http://i55.tinypic.com/261gguw.jpg )
Please check my previous comments, too.
Chew Internet Explorer
I have tested Noia Fox on a Firefox 4 with no add-on and the refresh-stop button displays correctly.