Firefox, youtube and fullscreen on 2nd screen via mini display port

I can make it full screen but soon as i click back here into main screen it goes to normal size
any ideas how to fix this?

Update.
Still having the problem.
I changed the mini displayport to displayport cable:
http://ca.startech.com/Cables/Audio-Video/DisplayPort/6-ft-Mini-DisplayPort-to- DisplayPort-Adapter-Cable-Male-to-Male~MDP2DPMM6
to this cable and am still having the same issue:
http://outlet.lenovo.com/us/en/itemdetails/0B47091/460/8FA0422CA6EA48B0BDED71D28 7F73673
I have heard that the issue may have something to do with the number of pins contained in the cable:Try another DisplayPort cable (One that is VESA compliant). Non-compliant DisplayPort cables may have snyc issues and may also have the # 20 pin pwr cable active. The # 20 pin is not suppose to be active and it may cause damage to your hardware.
The new Lenovo cable does not indicate if it is VESA compliant.
The main issue here is that after the Macbook Pro screen flashes blue upon waking, the screen brightness keys do not function. Only after removing the mini dispalayport cables do the brightness keys (F1&F2) function again.
Would really appreciate it if someone knows how to solve this issue?
Kind regards

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Firefox, youtube and fullscreen on 2nd screen via mini display port

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