Recent crashes of certain multimedia contents (this includes Youtube videos, certain flash games and other applications) in conjunction with Firefox are most probably caused by a recent Flash update and/or a malfunctioning browser plugin such as Real Player.

In order to remedy the problem, please perform the steps mentioned in these Knowledge Base articles:

• Flash Plugin - Keep it up to date and troubleshoot problems

• Adobe Flash plugin has crashed - Prevent it from happening again

• Flash 11.3 doesn't load video in Firefox

Other, more technical information about these issues can be found under these Links:

• http://forums.adobe.com/thread/1018071?tstart=0

• http://blogs.adobe.com/asset/2012/06/inside-flash-player-protected-mode-for-firefox.html

Please tell us if this helped!

Try Firefox Safe Mode to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.

(If you're not using it, switch to the Default theme.)

• On Windows you can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.
• On Mac you can open Firefox 4.0+ in Safe Mode by holding the option key while starting Firefox.
• On Linux you can open Firefox 4.0+ in Safe Mode by quitting Firefox and then going to your Terminal and running: firefox -safe-mode (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
• Or open the Help menu and click on the Restart with Add-ons Disabled... menu item while Firefox is running.

Once you get the pop-up, just select "'Start in Safe Mode"

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article for that.

To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.

Thank you.

I had the same problem.

I went through the troubleshoot and it's not the extensions etc.

The Adobe Flash Player Plugin version 11.9.900.117 seems to be the problem.

Flash still plays fine, just the pop-up happens and not sure why.

If it's annoying you, try installing the older version:

Uninstal this version (v11.9), and re-install the older version (v11.8)

You can find older versions on : http://helpx.adobe.com/flash-player/kb/archived-flash-player-versions.html

To test this, I installed this version : (Released 9/10/2013) Flash Player 11.8.800.168 (156.2 MB)

It downloads a zip file, which contains 7 files, I ran the file : flashplayer11_8r800_168_win.exe

And now the pop-up does not happen.

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Note 1: I did this:

1: uninstall v11.9

2: open firefox (so I'm opening up firefox without flash)

3: go to youtube = a popup to install flash appears, click to install

The version it offered was not 11.9, but 11.8 : strange! why not v11.9?

anyway, if you try to install v11.8 this way, it always fails

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Note 2: This problem only happens on my main home desktop and does not happen on my other machines (which all are Firefox Sync-ed, so all running same extensions etc...)

Strange!

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I had the exact same problem. Just fixed it by following the instructions on a blog post. Link is below.

The error appears on every page requiring flash. It does not prevent flash from loading but is extremely annoying. I have read about this issue elsewhere. The problem is Flash Player Plugin 11.9 is not compatible with Firefox 24 So, until Adobe finds a fix for this, you will need to downgrade to Flash Player 11.8. This fixes the issue and prevents the annoying message from appearing again.

Check out How to fix Flash Plugin error 0xc0000710 Error in Firefox

Thank you...fixed the problem perfectly.

In my plugin page, I have two versions, 11.8 and 11.9. I selected Never Activate for 11.8 and the error message ceased. This error started around 10/8/2013 when the new version was released. That is around when it started happening to me too.

Here is the link an article I found: http://www.fixnowsupport.com/3/post/2013/10/fix-flash-player-plugin-error-0xc0000710-in-firefox.html

11.9 seems to be working fine for me. Maybe everybody else missed this plugin version conflict?

Hi TheBioComputer, if Flash is in use when the Adobe updater runs, it can't remove the old version so you end up with both. If the latest works, that is the more secure choice. If it doesn't -- and the reason it causes errors for some people might be related to settings or conflicts with other software, I don't know -- then you could switch to using 11.8 instead.