You can add an add-on to the browser that allows you to print any Web page or browser tab as a PDF document.

Install PrintPDF Step 1 Launch Firefox and navigate to the Mozilla Web page that offers the free PrintPDF add-on (see Resources). Step 2 Click 'Add to Firefox," click the "Install Now" button when it appears and then click "Restart Now" to restart the browser. Step 3 Navigate to any Web page after Firefox restarts and click "File." Select "Print to "PDF" and type a name for the file you are about to create in the "File Name" text box.

Step 4

Click "Save." The add-on prints the Web page to the PDF file you designated in the "File Name" text box.

Use Print Pages to PDF Step 1 Visit Mozilla's Print Pages to PDF add-on Web page (see Resources) and click "Add to Firefox." Step 2 Click "Install Now" and wait for the "Restart Now" button to appear. When it does, click that button to restart Firefox. Step 3 Visit a Web page and right-click that page. Click "Print Pages to PDF" to view a menu containing print options. These options are "Print Active Tab," "Print Active Tab (Text)," "Print All Tabs" and "Print All Tabs (Text)." Step 4 Select the desired print option. The add-on prints the content you selected and displays it in your PDF reader. If you select one of the "Print All Tabs" options, the add-on combines all tabs into a single PDF. Choosing one of the options that has "Text" in the name causes it to only print text from Web pages. You can also right-click a tab or bookmark to view the menu that contains print options.

Why Firefox 31 from July 2014?

Much newer versions of Firefox have a PDF reader built in as Chrome has, you don't need "add-on" anything to have that feature.