Firefox Hang loading websites

1. At the top of the Firefox windowOn the menu bar, click on the ToolsFirefoxEdit menu, and select Options…Preferences….
2. Click the Advanced icon.
3. Click the Network tab.
4. Click Settings. The Connection Settings dialog appears.
5. If Automatic proxy configuration URL is selected, you are using an automatic proxy configuration file. Do not disable this setting, which will prevent you from accessing the Internet. Instead, provide this link to your network administrator.
6. Click Cancel.