Please try to run your browser in safe mode and second things if you are using an outdated version of FIrefox so please upgrade it.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

• Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
• Do NOT click the Reset button on the Safe Mode start window

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

The page opens normally for me.

Wait a minute, your System Details shows;

Installed Plug-ins

Shockwave Flash 14.0 r0 Shockwave Flash 12.0 r0 Shockwave Flash 11.9 r900 Shockwave Flash 11.6 r602 Shockwave Flash 11.6 r602

AND

Adobe PDF Plug-In For Firefox and Netscape 11.0.07 Adobe PDF Plug-In For Firefox and Netscape "9.5.5"

Having more than one version of a program may cause issues.

Flash is notorious for not cleaning out the older version as part of an update. Grab the uninstaller from here: Uninstall Flash Player | Windows Uninstall Flash Player | Mac

Then reinstall the latest version.

Update your Shockwave Flash v14. http://get.adobe.com/shockwave/ The link for Flash Player is: http://get.adobe.com/flashplayer/