Firefox gives me a pop-up which says "Something is preventing Firefox from updating securely. Please make sure you have the latest version of Firefox from: http://www.firefox.com". I have reinstalled Firefox 4 several times, and this keeps happening every couple of days. EDIT: The message has changed. It now reads: "Something is trying to trick Firefox into accepting an insecure update. Please contact your network provider and seek help." I still do not understand what could be making Firefox tell me this.