Starting The Profile Manager

Something is preventing Firefox from loading your profile correctly. You may want to try loading Firefox in Safe Mode with add-ons disabled. [https://support.mozilla.com/en-US/kb/Safe%20Mode How To Start Firefox in Safe Mode] Once you're in Safe Mode you can view a list of your plugins in '''Tools > Add-Ons > Plugins''' and disable each plug-in one by one until Firefox can open normally outside of safe-mode. If disabling one particular plugin fixes the problem you will need to uninstall that plugin. You are not able to uninstall plug-ins from within Firefox itself but sometimes they are related to other programs installed on Windows. [http://plugindoc.mozdev.org/faqs/uninstall.html Uninstalling Plugins FAQ] Your system details shows that your Firefox version is 3.x however the latest version is 4.0.1. If you're not sure you've installed the latest version you can try downloading the latest version and installing it again. [http://www.mozilla.com/en-US/firefox/fx/ Mozilla Firefox Homepage] Visit this link to determine if your Firefox plugins are truly up-to-date. [http://www.mozilla.com/en-US/plugincheck/ Mozilla Firefox Plugin Check] As a last resort you can uninstall and reinstall Firefox, while keeping existing user settings and profiles, but if it continues to hang while booting, as a final resort you can delete your profile and start over. Take note you '''will''' lose all of your preferences, bookmarks, and stored search queries and passwords. [https://support.mozilla.com/en-US/kb/Managing-profiles Starting The Profile Manager]