Can't login to Gamespot site with Firefox, have to use Chrome...

Is there a know bug or issue with Firefox and the site ?

Firefox is my main web browser and would like it if I could login with it.

Otherwise I'm just stick to other gaming sites like IGN and PCGamer for my gaming reviews since Firefox logs into those sites just fine.

NoScript is off and it still does not login, run AdBlock+ and have no problems anywhere with it effecting login.

I don't know why you would blame either addon?

There is a post already with many people claiming Firefox no longer logs into the site since the changes they made to it.

Just disabled Adblock+ and tested and still Firefox could not login into the site.

Serious you've broken something on your end and until you get it fixed I won't be using this site for my gaming news and reviews.

What exactly happens when you try to log in?

You should try Firefox in "safe mode" (not to be confused with Windows Safe Mode), and see if you can log in.  If so, it's an addon or plugin, most likely.

http://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode

As a heavier handed fix you could back up your bookmarks, uninstall Firefox, delete any Mozilla folder in %APPDATA% if remaining,  reinstall Firefox and import your bookmarks.   Essentially starting with a clean slate. 

I've used Firefox exclusively since version 2, and no issues with Gamespot.