If you have problems with current Shockwave Flash plugin versions then check this:

• see if there are updates for your graphics drivers

https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

• disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)

https://forums.adobe.com/message/4468493#TemporaryWorkaround

• disable hardware acceleration in the Flash plugin

https://forums.adobe.com/thread/891337 See also:

• http://kb.mozillazine.org/Flash#Troubleshooting

I have spent most of the day beating my head against this. I have done everything suggested so far, and I still cannot videos to play from Facebook. I have determined that the problem appears to be specific to Facebook, since plugin-container will run and play videos from Yahoo.com. However, I f I try to play a video from facebook, it appears to go into some sort of loop eating up memory (up to about 230,000K) then hangs and dies. After that, if I try to play a video from Facebook I cannot see plugin-container even try to start (from Windows Task Manager).

What I have done today: Driver: I was finally able to get the graphic driver updated to the "latest" version. However I m running via/s3g unichrome pro ipg. Via no longer lists it as a product. I did locate an upgrade driver on majorgeeks.com. but what appears to be the latest is V6.14.10.342 (11/10/2006). After considerable fuss and bother, I finally go it to load, but it didn't help.

Disabled Protected mode from flash player: ProtectedMode=0 in mms.cfg Also set dom.ipc.plugins.flash.disable-protedted-mode 0

Disabled hardware acceleration: options>advanced>use hardware acceleration when available (unchecked)

From "Troublshooting" Compositing Basic Asynchronous Pan/Zoom none WebGL Renderer WebGL is currently disabled. WebGL2 Renderer (no info) Hardware H264 Decoding No; Failed to create H264 decoder Audio Backend winmm Direct2D Blocked for your graphics card because of unresolved driver issues. DirectWrite false (0.0.0.0) GPU #1 Active Yes Description VIA/S3G UniChrome Pro IGP Vendor ID 0x1106 Device ID 0x3108 Driver Version 6.14.10.342 Driver Date 11-10-2006 Drivers vtdisp Subsys ID 00000000 RAM Unknown

I also disabled "autoplay" in Facebook

I called for more help.

I also have a second computer that is having the same problem. The latest driver I could find was Driver Version 6.14.10.4396 but it's calling for version 6.1400.1000.5218 or newer. WebGl is disables.

However, I am getting the same error running the Intel driver as I was with the VIA driver: Hardware H264 Decoding No; Failed to create H264 decoder

Compositing Basic Asynchronous Pan/Zoom none WebGL Renderer WebGL is currently disabled. WebGL2 Renderer (no info) Hardware H264 Decoding No; Failed to create H264 decoder Audio Backend winmm Direct2D Blocked for your graphics driver version. Try updating your graphics driver to version 6.1400.1000.5218 or newer. DirectWrite false (0.0.0.0) GPU #1 Active Yes Description Intel(R) 82865G Graphics Controller Vendor ID 0x8086 Device ID 0x2572 Driver Version 6.14.10.4396 Driver Date 9-20-2005 Drivers ialmrnt5 Subsys ID 4c438086 RAM Unknown Diag

The Facebook videos may be using HTML5 player instead of Flash Player Plugin.

A easy way to see if you can play HTML5 videos in Firefox is to go to https://www.youtube.com/html5/ as they should be all blue check marks.

Since you have the old EOL WinXP and not Vista or later you may not be able to play HTML5 without some workarounds.

With some workarounds you may be able to. http://www.msfn.org/board/topic/175591-enable-mp4-h264-aac-html5-video-in-firefox-on-windows-xp-without-flash/

Welllll....before I got around to checking out this information, Facebook appears to have gone back to the "old" format or something. Because not I am able to play their videos OK, So I guess we can mark this "solved" since I don't have much of a way to check this out now... Thanks for the help.