You can find toolbar buttons to zoom in and out in the toolbar palette and drag them on a toolbar. Open the Customize window via "Beeld > Werkbalken > Aanpassen" or via "Firefox > Opties > Werkbalkindeling" *http://kb.mozillazine.org/Toolbar_customization *https://support.mozilla.com/kb/Back+and+forward+or+other+toolbar+items+are+missing ---- You can use one of these extensions to set a default font size and page zoom on web pages: *Default FullZoom Level: https://addons.mozilla.org/firefox/addon/default-fullzoom-level/ *NoSquint: https://addons.mozilla.org/firefox/addon/nosquint/