In ext.PageTriage.viewUtil.js, there is a synchronous AJAX request executed on page load. Firefox 30 complains about this in the JS console:
Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help http://xhr.spec.whatwg.org/
Don't know why this request has to be synchronous. Code should be refactored so it can be made asynchronous.