In the Connection section, click Settings…. Change your proxy settings: If you don't connect to the Internet through a proxy or don't know whether you connect through a proxy , select No Proxy.
Enter proxy server settings , OS X Lion: Enter proxy server settings. Close the Connection Settings window. Any changes you've made will automatically be saved. Click the menu button In the General panel, go down to the Network Proxy section. In the Network Proxy section, click Settings….
Close the Connection Settings dialog. If you find that changes you make to your Firefox connection settings are not remembered when you restart Firefox, see How to fix preferences that won't save. IPv6 Firefox supports IPv6 by default, which may cause connection problems on certain systems. To disable IPv6 in Firefox: In the address bar , type about: Click I'll be careful, I promise! I accept the risk! In the Search field, enter network. In the list of preferences, double-click network.
DNS Prefetching Firefox attempts to speed up loading new websites by using DNS Prefetching , which can cause page load errors with some system configurations. To disable DNS Prefetching: Right-clickHold down the Ctrl key while you click in the list of preferences, select New, and then select Boolean. In the Enter the preference name field, enter network.
Select true when prompted to set the value and click OK. Firefox cannot load certain websites If you find that Firefox can load some websites but not others, first clear your Firefox cookies and cache: In the Time Range to clear: Click the arrow next to Details to display the list of items that can be cleared.
Select both Cookies and Cache. Check for malware If clearing your cookies and cache did not enable you to load the websites that did not work in Firefox, you should check your computer for malware. Certain types of malware are known to target Firefox and can prevent it from loading various websites: If you have an antivirus or Internet security program, update its detections database and do a full scan of your system. These fine people helped write this article: You can help too - find out how.