Problems with realease 3.1.1-4 on Mozilla-FireFox browser

Hello everybody!!!

I upgrade our production instance to 3.1.1-4 but the problem is that some of our user use the mozilla-firefox browser and when they try to work in it, the things don´t go a permanently loanding icon appears in the interface and no continues such the next image show it:


Have you tried emptying the browser cache?