PDFit is a Firefox extension which allows you to convert any webpage into PDF.

1. Open the Firefox Add-ons page. (Ctrl + Shift + A)

2. Search for PDFit and install it.

 

3. Restart the Firefox.

4. You can find the PDFit functions on the right click menu.

 

5. You can also use hotkey to save the PDF.

• Alt + 1 Save whole page as a image
• Alt + 2 Save visible area as a image
• Alt + 3 Save whole page as PDF
• Alt + 4 Save visible area as PDF

Done =)

Reference: Convert any Web Page to Image / PDF in Firefox