Firefox updates latest version, but sites like You Tube don't recognise it.

I've installed the latest version of Firefox, but when I visit YouTube, it still displays the message that I need to update to the latest version, as mine is not supported, even though I have the latest version!
== This happened ==
Every time Firefox opened
== YouTube introduced the changes.

Your user-agent indicates that you have/had the MegaUpload Toolbar installed and that can interfere with your system recording the correct version of Firefox.
See:
http://en.wikipedia.org/wiki/User_Agent
http://kb.mozillazine.org/Problematic_extensions (scroll down to "MegaUpload Toolbar")
To uninstall a toolbar or other extensions or to troubleshoot extensions and themes, see:
http://kb.mozillazine.org/Uninstalling_toolbars
http://support.mozilla.com/en-US/kb/Uninstalling+add-ons#How_to_uninstall_extensions_and_themes
http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes
You will also need to reset a preference.
<u>'''Reset general user-agent'''</u>
-type '''about:config''' in the URL/address bar and press the Enter key
-if you see the warning, accept it (promise to be careful)
-Filter = general.useragent.extra.firefox
-the item will be '''bold''' and show '''user set'''
-right-click that preference and select Reset
-restart Firefox (File > Restart Firefox)
<u>'''''Other Issues'''''</u>: ~~red:You have installed plug-ins with known security issues. You should update them immediately.~~
<u>'''You'''</u> ~~red:<u>'''MAY'''</u>~~ <u>'''need to Update Adobe Reader for Firefox (aka Adobe PDF Plug-In For Firefox)'''</u>: your ver. N/A; current ver. 9.3.3 (important security update release 06-29-2010; see: http://www.adobe.com/support/security/bulletins/apsb10-15.html)
~~red:Check your version here~~: http://www.mozilla.com/en-US/plugincheck/
See: http://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox#Installing_and_updating_Adobe_Reader
''<u>You may be able to update from the Adobe Reader installed on your system</u>'' instead of going to the Adobe site and downloading. Start > Program Files, find and click Adobe Reader to open, click Help, click Check for Updates.
''<u>If you go to the Adobe site to download the current Adobe Reader:</u>''
-'''<u>use Firefox to download</u>''' and <u>'''SAVE to your hard drive'''</u> (save to Desktop for easy access)
~~red:-See the images at the bottom left of this post to see the steps to take on the Adobe site~~
-exit Firefox (File > Exit)
-check to see that Firefox is completely closed (''Ctrl+Alt+Del, choose Task Manager, click Processes tab, if "firefox.exe" is on the list, right-click "firefox.exe" and choose End process, close the Task Manager window'')
-double-click on the Adobe Reader installer you just downloaded to install/update Adobe Reader
*<u>'''NOTE: On Vista and Windows 7'''</u> you may need to run the plugin installer as Administrator by starting the installer via the right-click context menu if you do not get an UAC prompt to ask for permission to continue (i.e nothing seems to happen). See this: http://vistasupport.mvps.org/run_as_administrator.htm
*'''<u>NOTE for IE:</u>''' Firefox and most other browsers use a Plugin. IE uses an ActiveX version. To install/update the IE ActiveX version, same instructions as above, except use IE to download the ActiveX installer.
*Also see: http://kb.mozillazine.org/Adobe_Reader ~~red:'''''AND'''''~~ [[How do I edit options to add Adobe to the list of allowed sites]]

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