Download Firefox Systems and Languages Novetats Privadesa Settings Customization Customize product appearance and functionality to suit your preferences. Tot All articles and threads Import and export settings Customization Add-ons, extensions, and themes In English Customize Firefox controls, buttons and toolbars Restore the Menu bar in Firefox Font size and zoom - increase the size of web pages Bookmarks Toolbar - Display your favorite websites at the top of the Firefox window Use themes to change the look of Firefox Change the fonts and colors websites use