I can't see any video website like youtube, vimeo, even facebook. My flash player is installed and it's work because I still can see the video in IE, only on Firefox it only audio work, the video is all blank(black), anyone can help me?

I didn't update or download anything, then today I can't see any video website like youtube, vimeo, even facebook. My flash player is installed and it's work because I still can see the video in IE, only on Firefox it only audio work, the video is all blank(black),
when I restart my PC again the video can work just first video, then when I see another website video it all black...... (but sound still work)
anyone can help me?

Try to disable the hardware acceleration in the Flash Player.
See:
* https://support.mozilla.org/kb/Cannot+view+full+screen+Flash+videos
* http://www.youtube.com/swf_test.html (right-click the player: Settings)
Flash "Display settings" window:
* http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html
Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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Why doesn't flash player stay installed and why does the saved file disappear.

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So is it actually installed, or is it not? If not, download and run the offline installers:
Flash Player for ActiveX (Internet Explorer)
Flash Player Plug-in (All other browsers)
If it still does not work correctly, check
http://forums.adobe.com/thread/885448
http://forums.adobe.com/thread/867968
In Firefox also check if the Shockwave Flash plugin is enabled.

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The subject is the question. Files with flv extensions cannot be run or identified. Other software that uses flash player such as Rhapsody, can't find or use it either. It feels like a registry problem. Please do not waste time suggesting I uninstall and reinstall flash player as I have done than several times with no improvement or solution.

Flash Player is a plugin, and typically used by browsers (and sometimes other software.) Flash, by itself, won't open flv files. Instead you'd load those files into your web browser and it would load Flash to render them.
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After much interwebbitubing , that is indeed the solution ! Bravo ! Thank you !
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* [http://www.java.com/en/download/help/testvm.jsp Test your Java Virtual Machine (JVM)] at java.com.
* [http://browserspy.dk/java.php Java Information - BrowserSpy.dk]
* [http://javatester.org/ Java Tester] - The test pages at javatester.org will tell you if your web browser is enabled for Java and, if so, the Java version.
* [http://www.pinlady.net/PluginDetect/Java/ Java Plugin Detector]
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TOAST!
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A good place to ask questions and advice about web development is at the mozillaZine Web Development/Standards Evangelism forum. 
The helpers at that forum are more knowledgeable about web development issues. 
You need to register at the mozillaZine forum site in order to post at that forum. 
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I can't see any video website like youtube, vimeo, even facebook. My flash player is installed and it's work because I still can see the video in IE, only on Firefox it only audio work, the video is all blank(black), anyone can help me?

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