Update to Firefox 3.6.19. It is the most Stable version in Firefox 3.x series

• http://www.mozilla.com/en-US/firefox/all-older.html

Troubleshooting extensions and themes

• https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes

Managing the Flash Plugin

• https://support.mozilla.com/en-US/kb/Managing%20the%20Flash%20plugin

Troubleshooting Plugins

• https://support.mozilla.com/en-US/kb/Troubleshooting%20plugins

Check and tell if its working.

ive updated everything. according to the updater, i have the latest version of firefox and the plugins. the same happens with 32 bit internet explorer. 64 bit wont run the flash player

Download Adobe Flash Player 11 Beta

• http://labs.adobe.com/downloads/flashplayer11.html

Check and tell if its working.

i failed to realise flash updates affect everything, not just firefox. so restarting only firefox didnt activate it. i restarted my computer and it works now. thanks for trying to help though

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I'm also having this problem but it seems.. sporadic. It only happens the FIRST time I visit Youtube or view content with an embedded video. If I view more content after that I don't have the problem until I restart.

Firefox hangs for 5 to 20 seconds and I can't do anything with the program during that time - then it unfreezes and loads the video as normal (in all other respects, it works).

I've updated Firefox to the latest version, updated Flash to the latest version and updated Java to the latest version.

I'm running Windows 7 64-bit and Firefox 7.0.1 on a quad core AMD system with 8GB of RAM.

I see a lot of these problems came up a couple of months ago... no solution was ever found?

-> Clear Cookies & Cache

• https://support.mozilla.com/en-US/kb/Template:clearCookiesCache

-> Clear the Network Cache

-> Reload web page(s) and bypass the cache.

• Press and hold Shift and left-click the Reload button.
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Cmd + Shift + R" (MAC)

Check and tell if its working.