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Mac computers - FF 29.0 and 30.0 does not display the video layer in the Revolution Slider section of WordPress site. Why?

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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?

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?

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What is the format of the HTML5 video and the specified content type? Support for different formats has been trickling out to different platforms in different releases.

If you think it would be helpful, feel free to post a link to the page that has the problem.

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Sorry for delay. Here is the link: laserstar.pl Video file - it's MP4. It's large - about 30MB.

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Can you play the video on YouTube?

Note that Mac lacks support to play MP4 files natively without using a Flash player.