I thought Firefox for MacOS integrated Print Preview into the Print dialog somewhere. No? On Mac, the native Firefox Print Preview function is not exposed on the menus. In order to access it, you need an add-on which provides a button or right-click (Ctrl+click) context menu item. For example: * Button: https://addons.mozilla.org/firefox/addon/preview-print-button/ * Context menu: https://addons.mozilla.org/firefox/addon/print-print-preview-context/ Does one of those work on your Firefox?