Pages appear tiny when I print or view them in Print Preview

There is a known issue in Firefox version 47 that causes your pages to appear very small when you print or view them in Print Preview on Windows computers.

Good news! There’s a fix coming in Firefox version 48. In the meantime, follow these steps to fix the problem:

1. Type about:config in the address bar and press EnterReturn.
   A warning page may appear. Click Accept the Risk and Continue to go to the about:config page.
2. Look for the print.printer_*.print_paper preference. (Tip: Enter paper in the search field to find it quickly.)
3. Look for your printer. You’ll see the following paper size settings:
   • print_paper_height=11.00
   • print_paper_width=8.50
   • print_paper_size_unit=1
4. Set the print_paper_height and print_paper_width to -1.
5. Your changes are saved immediately. Close the about:config tab.
6. Print the page again. You should be able to print or preview it in its normal size.