[Solved] After watching several youtube html5 720p videos, Firefox (version 33) display or screen turns black and aero transparency in windows 7 turns opaque.

Hello ! I just want to share something familiar with that black display or screen occurs for some people. When I watch youtube videos, I used to watch them in html5 720p videos (not flash videos, https://www.youtube.com/html5 ). I upgraded firefox to version 33. No black display when I used it. Randomly and after watching several html5 videos on youtube, aero transparency in my windows 7 turns opaque and firefox display goes all black. Firefox doesn't respond at any command. I need to kill his process in task manager in order to close it. When I open firefox again, normal display goes. To relaunch aero transparency in windows 7, I need to restart the service whose name is, I think, "Desktop Window Manager Session Manager". I use windows 7 in french and the service name is "Gestionnaire de sessions de Gestionnaire de fenetrage".
To solve this, I upgraded my graphic driver but this didn't work. I tried to put "layers.offmainthreadcomposition.enabled" to false in "about:config" menu. No random black display but some html elements turned black for some seconds or definitely when firefox rendered web pages. I tried to uncheck "Use hardware acceleration when available" in options menu. No random black display but html5 720p videos didn't play smoothly.
Then, I chose to watch youtube 720p videos again with flash player and no random black display and html5 720p videos played normally.
Here are my graphic acceleration infos :
Date du pilote 7-2-2014
Description de la carte NVIDIA GeForce GTS 360M
DirectWrite activé false (6.2.9200.16492)
Fenêtres avec accélération graphique 1/1 Direct3D 11 (OMTC)
GPU #2 active false
ID du périphérique 0x0cb1
ID du vendeur 0x10de
Pilotes de la carte nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
RAM de la carte 1024
Rendu WebGL Google Inc. -- ANGLE (NVIDIA GeForce GTS 360M Direct3D9Ex vs_3_0 ps_3_0)
Version du pilote 9.18.13.4052
windowLayerManagerRemote true
AzureCanvasBackend skia
AzureContentBackend cairo
AzureFallbackCanvasBackend cairo
AzureSkiaAccelerated 0
I hope this will be useful to solve this problem in future versions or to someone.

This is happening to me too, I don't know if this is an Adobe Flash Player 11.5's bug or it's just my computer. All my browsers, chrome, IE9, Fox, doesn't even load anime videos. I tried reinstalling 11.5 many times, it have no effect but I use IE9 64-bit to run the videos that couldn't run. I waited 25 min for a JW player to load an episode of anime and I'm sick of it.

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[Solved] After watching several youtube html5 720p videos, Firefox (version 33) display or screen turns black and aero transparency in windows 7 turns opaque.

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