There are plenty of extensions you can install that allow you to create PDF file for any webpage you come across. Well, if you are using Linux (particularly Ubuntu), this PDF creation feature is already inbuilt in your system and you can use it without installing any other extensions/applications. In Ubuntu, regardless which browsers or applications you are using, as long as it supports the “Print” function, you can quickly create a PDF, postscript or SVG file of the work you are doing (or the webpage that you have come across).