Why wont Youtube videos load when using Firefox 3.6.3?

I've been having issues with youtube when using firefox, the video doesnt load or show up for that matter its just a black screen where the video should be and on the bottom left hand corner of Mozzilla it says "done" I've tried everything, I updated java and flash but nothing seems to work. What can I do? I know I can use other web browsers but I really want to fix this
== URL of affected sites ==
www.youtube.com

There are a few reasons why youtube might be broken:
* An extension may be causing the problem: try the steps at [[Troubleshooting extensions and themes]]
* ''Bad item stored in the Browser Cache'': Follow the steps at [[How to clear the cache]].
* Firewall software is blocking some resources on the page: see [[Firewalls]]
If none of this works, let me know if Flash video from other sites work. Here are a few you can try:
*[http://www.dailymotion.com/video/x9hvlb_3d-toy-story-3-2010-teaser-trailer_shortfilms]
*[http://www.hulu.com]
*[http://www.cuatro.com/el-hormiguero/videos]

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Hello,
Try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.
You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).
Then perform these steps:
*Click the orange Firefox button at the top left, then select the "Options" button, or, if there is no Firefox button at the top, go to Tools > Options.
*In the Firefox options window click the ''Advanced'' tab, then select "General".
*In the settings list, you should find the ''Use hardware acceleration when available'' checkbox. Uncheck this checkbox.
*Now, restart Firefox and see if the problems persist.
Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:
* [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]]
* [[Upgrade your graphics drivers to use hardware acceleration and WebGL]]
Did this fix your problems? Please report back to us!
Thank you.

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Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. For instructions, launch the System Preferences application, select Help from the menu bar, and enter “Set up a guest account” (without the quotes) in the search box. Don't use the Safari-only Guest login created by Find My Mac.
While logged in as Guest, you won’t have access to any of your personal files or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem(s)?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
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Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
Press the power button.
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Test while in safe mode. Same problem(s)?
After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of steps 1 and 2.

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Hi guys,
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<blockquote>Locking duplicate thread. 
Please continue here: [/questions/788365]</blockquote> 
for some reason out of the blue youtube blinks when I am scrolling on a page while playing a video. I tried deleting the cookies which appears to have worked until I re-logged into my youtube account and any video I watch still blinks. Have any ideas?

Hello toekneesee, try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.
You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).
Then perform these steps:
*Click the orange Firefox button at the top left, then select the "Options" button, or, if there is no Firefox button at the top, go to Tools > Options.
*In the Firefox options window click the ''Advanced'' tab, then select "General".
*In the settings list, you should find the ''Use hardware acceleration when available'' checkbox. Uncheck this checkbox.
*Now, restart Firefox and see if the problems persist.
Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:
[[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]]
[[Upgrade your graphics drivers to use hardware acceleration and WebGL]]
Did this fix your problems? Please report back to us!
Thank you.

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Intel Core i5
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When using Firefox certain videos play but the image is green and distorted. The image turns into lines and sometimes it half of the screen of the video. Examples are streaming MLB.tv video and some vimeo videos. The odd thing is that it isn’t all Vimeo videos. Is this a flash issue?
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Screen Caps: http://yfrog.com/1x46496103j and http://yfrog.com/n112309689j
Any help?
== URL of affected sites ==
http://

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Ref:
http://kb.mozillazine.org/Flash#Performance_or_display_issues_with_certain_Flash_videos

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See:
*http://kb.mozillazine.org/Firefox_crashes
*https://support.mozilla.org/kb/Firefox+crashes
If you have submitted crash reports then please post the IDs of one or more crash reports that have this format:
*bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
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*You can open the about:crashes page via the location bar, like you open a website.
See:
*http://kb.mozillazine.org/Mozilla_Crash_Reporter
*https://support.mozilla.org/kb/Mozilla+Crash+Reporter

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Please Help. Thank You

Clear Cookies & Cache
* https://support.mozilla.com/en-US/kb/Template:clearCookiesCache
Clear the Network Cache
* https://support.mozilla.com/en-US/kb/How%20to%20clear%20the%20cache#w_clear-the-cache
Reload web page(s) and bypass the cache.
* Press and hold Shift and left-click the Reload button.
* Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
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* https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes
Check and tell if its working.

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I have had the same problem for some time now. As well as this problem, some QT movies load into QT but the sound does not play.
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Youtube videos loads but after 2-4 sec the player area gets blank with ivory white colour..
== This happened ==
Every time Firefox opened

Why are you using such an old version of Firefox. The older versions have known security issues. Consider upgrading to the current version. (Help > Check for Updates)
'''''Adobe Flash'''''
You are using a '''very old''' version of Flash Player. Updating Flash Player may solve your problem
'''Install/Update Adobe Flash Player for Firefox''': your ver. 10.0 r10; current ver. 10.1 r53 ('''important security update 2010-06-10''')
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'''''Other Issues''''': ~~red:You have installed plug-ins with known security issues. You should update them immediately.~~
'''Update Java''': your ver. 1.6.0.13; current ver. 1.6.0.20 (important security update 04-15-2010)
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The mouse driver is Synaptics but this works with all other apps and Internet Explorer, but suddenly stopped when using Firefox and all tabs. Not sure why so can you help?

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Why do YouTube videos stop? I have restarted,reset, played thru email and played thru app. It plays on my desktop fine.

Okay... No flash... understand...
So I went ahead and installed YouTube app on my IPhone... but now when I select the youtube video from Facebook I get into youtube and I can see the video I 'm trying to play, but now a message appears over the video "The content owner has not made this video available on mobile. Add to playlist to watch it later on a PC." At that point I was able to seach & select other videos by the artist (George Strait) off youtube and play them pkay on my Iphone, but not this particular one posted on facebook. Oh well.. I've spent enough time on this one, I know when I can't get there from here..
Thanks razmee209 for your help, its much appreciated..
Marvin

Why wont Youtube videos load when using Firefox 3.6.3?

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