Bitdefender's Trafficlight addon for Firefox has been blocking many good websites.
Including our forum and the blog (Had to disable Trafficlight to access the forum)
Apparently their chat support requires a license key (insert facepalm here).
Have tweeted to their support, hope they help me.
Addon Version: 0.1.22 updated on October 24th (today)
Firefox version: 7.0.1
OS: Win 7 Home Premium 32 bit, Kaspersky Internet Security 2012
Tested on: two computers, same result. Also uninstalled and reinstalled the addon, same result