After the last firefox updates I can not play videos in the browser. I have updated the plug-ins all to no avail

Question

I have tried running the videos on the BBC website and they time out after 20 sec. with the message "The content doesn't seem to be working. Try again later" all plugins are up to date, and the cookies are not barred
== This happened ==
Every time Firefox opened
== after last update

Answer 1

Videos from all three sites play fine for me (except the ones from tfl.fr that are only available if you are in France), so something is not quite right with your system. However bear in mind that some of them take a while to load.
The latest version of Adobe FlashPlayer can be obtained from here:
http://www.adobe.com/shockwave/download/download.cgi?P1ProdVersion=ShockwaveFlash
(You can check here: http://www.adobe.com/products/flash/about/ to see which version you should install for your Mac and OS.
You should first uninstall any previous version of Flash Player, using the uninstaller from here (make sure you use the correct one!):
http://kb.adobe.com/selfservice/viewContent.do?externalId=tn_14157
and also that you follow the instructions closely, such as closing ALL applications first before installing. You must also carry out a permission repair after installing anything from Adobe.
You should also ensure that you have downloaded and installed the correct version for your Mac of Security Update 2009-001 (and for Tiger only, 2009-002 and 003). (N.B. Security Updates require both a restart and a permission repair.)
You should also install Perian from http://perian.org/
You should read this support page http://perian.org/#support in case you need to delete older codecs.
In Macintosh HD/Library/Quicktime/ delete any files relating to DivX (Perian already has them). However it should be noted that Perian is not an internet plugin and will not play DivX files imbedded on a website. For that you will need the DivX Player browser plugin available from http://www.divx.com/divx/mac/
Now go to Safari Preferences/Security, and tick the boxes under Web Content (all 4 of them) to enable Java.
Lastly, repair permissions and restart your Mac.