Pressto,
Unfortunately I'm still relatively new here and do not work from inside of the office, so I don't yet have access to past emails to use as a reference. However, I would like to continue trying to solve your problem so I'm going to ask you to try a complete uninstall and reinstall of both Flash Player and Firefox.
1.) Go To: http://kb2.adobe.com/cps/141/tn_14157.html
2.) Download and run uninstall_flash_player.exe and follow the instructions to remove flash. This will remove the flash player from all browsers on your system.
3.) Go To: http://support.mozilla.com/en-US/kb/Uninstalling+Firefox
4.) Follow the instructions on that page (through Step 9) to uninstall Firefox.
!! While uninstalling be sure to check the "Remove my Firefox personal data and customizations" option. This is most important because we need to remove the old leftover information on your system as well as the program itself. !!
5. To remove all Firefox profile data, delete the following
directories if they still exist. [Username] is your Windows login name that is displayed at the top of the Start menu. Generally these folders are located in your main C:\ drive.
If you have Windows XP -
On your PC navigate to: \Documents and Settings\[username]\Application Data
Locate and delete the Mozilla folder.
On your PC navigate to: \Documents and Settings\[Username]\Local Settings\Application
Data
Locate and delete the Mozilla folder.
If you have Windows Vista and Windows 7 -
On your PC navigate to: \Users\[username]\AppData\Local
Locate and delete the Mozilla folder.
On your PC navigate to: \Users\[username]\AppData\Roaming
Locate and delete the Mozilla folder.
6.) Go To: http://www.mozilla.com/en-US/firefox/personal.html
7.) Download and re-install Firefox 3.6
8.) Once the installation is complete open Firefox and go to: http://get.adobe.com/flashplayer/
9.) Download and install the latest Adobe Flash Player (You may wish to Uncheck the "Free McAffee Security Scan Plus" option)
10.) Once the install is complete restart Firefox and try to login to the website again.
Until Firefox is working correctly you may wish to try downloading the Google Chrome browser and giving that a try. Many users have reported comparable in-game performance versus Firefox.
Please let us know if this helped.