http://mxr.mozilla.org/mozilla-central/source/accessible/src/jsat/TouchAdapter.jsm#66 mouseenter and mouseleave events shouldn't be used in chrome since adding listeners for them makes damage to the performance on the document.
Is this for Firefox OS or for Firefox for Android?
I don't know. Anyway, we need to avoid using them in chrome because if they're listened, nsEventStateManager needs to dispatch much a lot of those events. https://developer.mozilla.org/ja/docs/DOM/DOM_event_reference/mouseenter
Summary: TouchAdapter.jsm shouldn't use "mosueenter" and "mouseleave" → TouchAdapter.jsm shouldn't use "mouseenter" and "mouseleave"
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