In the Time Range to clear: drop-down, select Everything.

Click History and select Clear Recent History….

(If you don't see it, click the menu button, then click Library click the menu button.)

Click on the menu button to open the menu panel.Ĭlick the Library button on your toolbar.

If you find that Firefox can load some websites but not others, first clear your Firefox cookies and cache:

Press the Toggle button to set the preference value to true, if it's not already set.

If the preference doesn't already exist, select Boolean and click the Add button.

Enter the preference name in the about:config search bar.

In the list of preferences, click the Toggle button next to 6 to set its value to true.įirefox attempts to speed up loading new websites by using DNS Prefetching, which can cause page load errors with some system configurations.

Click Accept the Risk and Continue to go to the about:config page.

Type about:config in the address bar and press Enter Return.Ī warning page may appear.

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.įirefox supports IPv6 by default, which may cause connection problems on certain systems. Any changes you've made will automatically be saved.

If you connect to the Internet through a proxy, compare Firefox's settings to another browser's (such as Internet Explorer - see Microsoft's guide to proxy settings) (such as Safari - depending on your OS X version, see Mac OS X 10.6: Enter proxy server settings, OS X Lion: Enter proxy server settings, or OS X Mountain Lion: Enter proxy server 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.

In the Network Settings section, click Settings….

In the General panel, go down to the Network Settings section.

Click the menu button and select Settings.

Click the menu button and select Options Preferences. In the Menu bar at the top of the screen, click Firefox and select Preferences. To check your connection settings in Firefox: If you connect to the Internet through a proxy server that is having connection problems, you will not be able to load websites. For instructions on how to configure some programs, see the Configure firewalls so that Firefox can access the Internet article. In general, you should make sure your Internet security software is up-to-date and remove Firefox from your program's list of trusted or recognized programs, then add it back.

Note: Some Internet security programs can block Internet access even when they are in a 'disabled' state.

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