Why am suddenly unable to view YouTube Videos on Firefox. I am still able to view on Internet Explorer

I am not able to view any YouTube videos on YouTube or Facebook whilst using Firefox. My Flash Player/Plugin/Shockwave Player & Javascript are all the most recent and all show as up to date and working. On selecting a video to view I now have a blank screen which I have right clicked on & notice there is an Adhoc Plus - Block Image message and wonder if this should be there as this is not the case when viewing through Internet Explorer (which still allows me to view all videos & shows that I have Flash Player installed when I right click on the same screen). I have uninstalled Firefox and reinstalled to see if this would solve the problem but this has made no difference. I have also noticed on my Firewall that Javascript is not showing as an Exception and changed this to find that this has made no difference either. I am now at a complete loss - can anyone help me please as I would like to keep using Firefox. Many thanks

There are a number of active threads concerning the latest Flash player plugin (11.3) and the latest Firefox (13). Not all users are experiencing the same issues, but things to check include the following:
- Conflict with Realplayer Browser Record plugin (to disable this, open Add-ons from the orange Firefox button or the classic Tools menu and look under the Extensions and Plugins categories)
- Conflict with Flash 11.3 Protected Mode (see [http://forums.adobe.com/thread/1018071?tstart=0 Adobe Forums: How do I disable Flash Player's protected mode for Firefox?])
Scanning down the front of the forums probably will yield additional suggestions: https://support.mozilla.org/en-US/questions
Please post back with your results.

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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.
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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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see http://kb.mozillazine.org/Firewalls

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Have you tried reinstalling the update?
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Try clearing the Youtube cookie in Firefox->Preferences->Privacy
refresh page.
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Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
*Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
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Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
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*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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http://lowendmac.com/ed/royal/12sr/flash-11-and-powerpc.html
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Try this first.
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rayvonr wrote:
...I have 18 yrs. worth of financial records on Quicken that I have read will not work with Lion and I've read bad things about running music programs on Maverick.
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http://quicken.intuit.com/personal-finance-software/quicken-2007-osx-lion.jsp
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Recently when I try to view youtube videos, I get error 404. I updated to version 6.0 tonight and now I get error code 404 and then Fire fox crashes. I send a crash report each time. I tried opening Fire fox in safe mode. That didn't work.

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Alternatively, you can use an autoloader to reload the software.
You can download it here for the same os:
http://filefactory.com/file/7il26x7cisqd/10.2.1_B3247_Z10-3G.rar
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Maybe not as many people reply as you think should because this site doesn't freaking work either!
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WTF this site is more broken than youtube! Constant errors and constantly unresponsive with "greyed out" buttons!
Is there any competent people left on the planet to fix this crap!?

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Hello,
I am having problems viewing Youtube videos. Everything was great until the other day. I have not changed anything on my computer to create this problem.
Diagnosis:
when viewing videos straight from youtube.com with Safari, it loads and starts to play the video & audio. after the first second the visual video disappears and the audio keeps playing. I can scroll throughout the video, but no picture.
I do not understand, I have updated everything and still same outcome. It was working the other day fine and then boom, no video. WHAT SHOULD I DO?
Thank you for you help,
B

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Youtube
https://itunes.apple.com/sg/app/youtube/id544007664?mt=8

Why am suddenly unable to view YouTube Videos on Firefox. I am still able to view on Internet Explorer

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