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Firefox 7 won't play YouTube videos

New User

Firefox 7 won't play YouTube videos

Running Win7 x64. Upgraded to Firefox 7, then YouTube videos stopped playing. YouTube keeps insisting I need to install the latest flash player, which I have done several times (both "install_flashplayer10_mssa_aih.exe" and "install_flashplayer11x64_mssa_aih" versions), clear cookies, reboot and all that crap. Firefox refuses to play YouTube videos. Internet Explorer 9 (x64) plays YouTube videos fine. Am not using Firefox anymore. You have got to SUPPORT your app instead of leaving users floundering. This is also why I HATE upgrading. It too often causes new incompatibilities when I just want to leave what is working, the hell alone.


Accepted Solutions
New User

Re: Firefox 7 won't play YouTube videos

On Adobe forum, someone suggested

   * go to and
         o download the 64-bit uninstaller
         o download the 64-bit installer
   * close all browser windows, then run the downloaded uninstaller
   * restart Windows
   * delete any remaining files in
         o C:\Windows\system32\Macromed\Flash
         o C:\Windows\syswow64\Macromed\Flash
   * now run the downloaded installer

This still did not work. Then someone else said to install the ActiveX installer, which I found somewhere online.

THEN it finally worked. But I still dont get why I have to jump thru extra hoops, that are not explained in the first place- YT says I need to upgrade (even though my old W2k machine with FF 3 and Flash 10 is working fine), I click on the link on YT that takes me to Adobe, I download and install as the instructions lead, but that doesnt work. Why doesnt ActiveX install along with the Flash installer if it is necessary?

Expert User

Re: Firefox 7 won't play YouTube videos

You need the 32 bit version of Flash Player 10 (install_flash_player_11_plugin_32bit.exe). Firefox is a 32bit browser so you need the 32bit Flash player

New User

Re: Firefox 7 won't play YouTube videos

Thanks for reply, but it does not fix.

When I click on a YT video, the message reads "You need to upgrade your Adobe Flash Player to watch this video." and " Download it from Adobe" is a link to "Adobe Flash Player" which says it includes the 64-bit and 32-bit versions of Flash.

I click "Download Now", download & install "install_flashplayer11x64_mssd_aih.exe" (this updated in the last few hours), that supposedly covers x32. But it still does not work. So where is the mistake? Firefox, YouTube, or Flash? The info necessary to make this work is not adequately explained.

Back on Adobe, I select "Win7 32-bit" and "Flash Player 11 for Other Browsers (32 bit)", and 'Download Now', install "install_flashplayer11x32_mssd_aih.exe". But I still cant play YouTube videos.

What really does not make sense is that I can play YT videos fine in Firefox 3.0.19 on an old Win 2000 machine and some old version of Flash (I cant locate the version #). Again, this is why I hate upgrades. They just create as many new problems as they solve, when the version that worked years ago was just fine.

Expert User

Re: Firefox 7 won't play YouTube videos

What version of flash player does it report you have installed if you open Firefox and go to this url?

Site Moderator

Re: Firefox 7 won't play YouTube videos

New User

Re: Firefox 7 won't play YouTube videos

Am up to Flash v11,0,1,152. Is anyone getting Firefox 7 to play YT videos in Win7 x64? If so, which Flash version are you using?

Please point me at the exact version of Flash (name the version number) you think I should install to get Firefox 7 to play YT videos. But Flash does not seem to be the problem.

No recent Flash versions of 10 and 11 (x32 or x64) work for me in Firefox 7. The Flash installer covers both x32 and x64, so which browser I use shouldnt matter. All Flash versions DO work with IE x64. And Firefox 3 is playing YT vids fine with Flash v10,0,45,2 on Win2K(x32). So the problem seems to be in Firefox 7 in Win7 x64. Maybe Firefox needs to catch up with the rest of the x64 world.

Site Moderator

Re: Firefox 7 won't play YouTube videos

Can you find the Flash plugin file NPSWF32.DLL for Firefox?

You can find the Flash plugin file NPSWF32.DLL here after you have run the Flash installer:


If it is there then create a plugins folder in the Firefox Profile Folder and copy the file to that folder to see if that makes the Flash plugin work.

New User

Re: Firefox 7 won't play YouTube videos

The site are not accessible for some reason.

But in Firefox, I follow "Help > Troubleshooting Information > Profile Directory: Open Containing Folder" and it leads to "...\AppData\Roaming\Mozilla\Firefox\Profiles\vw1j8del.default".

I made a "plugins" folder inside the "vw1j8del.default" folder.

I copy the "NPSWF32.dll" file from "C:\Windows\SysWOW64\Macromed\Flash" and now I can finally play YT vids in Firefox.

But the question is, why do I have to jump thru all these hoops? Which component isnt working right?

Its very annoying when Firefox keeps nagging to upgrade every other day, then when I do, it screws things up, and I have to waste all this time on forums. Meanwhile, I keep an old W2K machine for email, I avoid upgrading anything on it, and it works just fine. Theres no appreciable difference between Firefox 3 and 7, except 7 is wasting my time.

Site Moderator

Re: Firefox 7 won't play YouTube videos

The Flash installer should have added a registry key on where to find the Flash plugin.


Apparently that hasn't happen in your case.

You can try to run the Flash installer as Administrator in such cases to see if that helps.

New User

Re: Firefox 7 won't play YouTube videos

The latest version of Firefox can be patched to work on flash players

According to instructions above, I copy file NPSWF32.dll

from: C:\Windows\SysWOW64\Macromed\Flash

to: C:\Users\usernamexxx\AppData\Roaming\Mozilla\Firefox\Profiles\ap8ypmhk.default\Plugins

Create this new "Plugins" folder

My system: Windows 7 Ultimate, 64 bits system

Firefox 7.0.1 (installed 10/21/2011)

Adobe Flash Player 11 Active X version installed 10/21/2011

Adobe Flash Player 11 Plugin 64 bit version installed 10/21/2011

Adobe Flash Player 10 Active X 64 bit version installed 4/20/2011

In the FireFox Add-on Shockwave Flash 11.01.152 is now enabled. The version shown is 11.0 r1 last updated 10/21/2011