Crashes or other problems with certain multimedia content in Firefox (such as Youtube videos and Flash animations or games) can often be resolved by performing the steps 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

On Windows Vista and above, you can disable Flash protected mode by following the instructions on these pages:

• http://forums.adobe.com/thread/1018071#TemporaryWorkaround
• http://kb.mozillazine.org/Flash#Disabling_Protected_Mode_in_Flash_11.3

(See this Adobe blog post for technical details about Flash protected mode.)

Please tell us if this helped!

If you have submitted crash reports then please post the IDs of one or more recent crash reports that have a "bp-" prefix:

• bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

You can find the IDs of the submitted crash reports on the about:crashes page.

• You can open the about:crashes page via the location bar, like you open a website, or open the crash reports page via "Help > Troubleshooting Information".

See:

• http://kb.mozillazine.org/Mozilla_Crash_Reporter
• https://support.mozilla.org/kb/Mozilla+Crash+Reporter

Okay, this was driving me crazy as well. Out of nowhere, flash was not working properly. I tried everything. I uninstalled shockwave and abobe flash multiple times and reinstalled. I researched online for hours trying to figure out what could be causing it. The main thing is that video was not working on Facebook or Youtube. I did some more research, and came upon the suggestion that the flash plug-in may need to be manually installed. I went to the Adobe Flash Player Distribution page at http://www.adobe.com/products/flashplayer/distribution3.html and I downloaded and installed both the EXE and the MSI Installer for plug-in based browsers. I restarted Firefox, and boom, everything worked fine! I hope this helps people and prevents you the hours of frustration I went through!