

Do not disable this setting, which will prevent you from accessing the Internet. If Automatic proxy configuration URL is selected, you are using an automatic proxy configuration file.In the General panel, go down to the Network Proxy Network Settings section.To determine if you use an automatic proxy configuration file: If you're using a proxy auto-config file (PAC), Firefox may hang when you attempt to load sites that don't exist or that you haven't opened recently. You can try updating your graphics drivers to see if that fixes it or simply run without hardware acceleration. If the problem is no longer happening, then hardware acceleration was likely the cause. Uncheck Use hardware acceleration when available.Under Performance, uncheck Use recommended performance settings.Click the menu button and select Settings. In the Menu bar at the top of the screen, click Firefox and select Preferences.You can try turning off hardware acceleration to see if it fixes the problem.

With some graphics card and graphics driver setups, Firefox may hang when using hardware acceleration. Your browsing history will be lost but Firefox will automatically import your bookmarks from the most recent backup file. When Firefox reopens it will create a new places database.To rename a file, right-click on it and select rename from the menu click on it once to select it and then click a second time on the file name to make it editable.

