For a language/script not in the list, choose Other Writing Systems. For instance, to set default fonts for the West European languages/scripts (Latin), choose Latin.From the Fonts for drop-down list in the Fonts dialog, choose a language group/script.In the Fonts dialog that opens, uncheck Allow pages to choose their own fonts, instead of your selections above.Under Fonts and Colors, click the Advanced… button.Some websites have custom fonts to disable them: Any changes you've made will automatically be saved. Under Fonts and Colors, use the drop-down menus to select the font and font size of your choice.In the General panel, go down to Language and Appearance.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.