Mac computers - FF 29.0 and 30.0 does not display the video layer in the Revolution Slider section of WordPress site. Why? We prepared simple Word Press web site. We used a Revolution slider plugin with HTML5 video layer. It works properly on Chrome, Safari, older Mozilla FF. But we had a problem on PC computers with FF 29.0 30.0 – after reinstall of browser everthing seems to be OK. The slider works. Unfortunately even the reinstallation on Mac computers does not help. There is no visible video on Mac FF 30.0. We are looking for some information what we can do to solve this problem. Could you help?