I am unable to watch Youtube videos on Firefox ?

I don't know why I am unable to play Youtube videos on Firefox (this problem stated around mid Sept. 2014).
I explored many solutions but in vain. Firefox/flash (I am not sure) is behaving weirdly, I found some solutions on 'Mozilla Support' when I apply these, I am able to play YT videos but after some time (usually after a re-boot) I get the screen "An error occurred please try again Later" and this cycle repeats. I use a public Wifi/LAN of my university and everyone(using Firefox) has the same problem, and everyone noticed the problem at the same time.
Some solutions I tried are:
1. Deleting Cache, Cookies, History etc etc
2. Uninstalling and Re-installing Firefox and flash.
3. I do have the latest version of both flash and Firefox
4. Using Firefox in safe-mode (Sometimes even in safe-mode I couldn't play YT videos)
5. Disabling Hardware Acceleration (though I use a I5 machine with Windows 7 and Intel(R) 3000 Graphics card).
6. Tweaking DNS settings (changed my DNS server address to 8.8.4.4 etc)
7. Degrading to previous versions of Firefox (I used FF 28.0 in Linux worked fine for a while and then the problem repeats itself)
I am confused, I am not sure where the problem is, because I use Linux(Ubuntu 14.04) and Windows 7 and in both of them Firefox won't play YT videos but Chromium/Chrome does. As I said before videos would play for certain time and then they would stop playing giving me "An error occurred please try again Later......". Another observation is there were only 2 resolutions (1020p and 240p ) available and the result won;t change even if I change them.

Hi, first of all Thank you for your instant response.
Yes, I have updated to version 33, Now the problem is not as random as it was before. I found that I have absolutely no issues when I use FF for the first time after starting my computer. At this point there is no issue at all I can watch videos when both logged-in/logged-out and also they work perectly if I switch between flash and HTML5.
But as soon as I restart Firefox I cannot watch the videos at all. No matter if I am logged in/logged out, I did try HTML5 but still it didn't work. The error message was same in all the cases "An error occurred, please try again later".
We are secured by "Cyberoam" so I don't have access to proxy sites.
By the way these observations are for Windows 7.

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