It’s really easy to take a full Webpage Screenshot using Firefox, in High Quality. Now here’s a more better way: Convert Complete Webpage/HTML into a PDF file!

Yes! This is possible. All you need is to install a very small extension in your Browser!
Get a small Firefox Extension from here and install it. You will find the Control Icon at the Top-Right Corner of your Browser Screen (See Below)

The extension/add-on is also available for Internet Explorer right here. Google Chrome, Opera and Safari users can refer this page (Uses Page Bookmarklet Feature)
This Webpage to PDF conversion will definitely help you a lot!
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A great find! Just installed it.
Thanks