Firefox Automatic Zoom Shortcut

What is the keyboard shortcut for Automatic Zoom in Mozilla Firefox?

Keyboard Shortcut for Automatic Zoom in Firefox

Automatic Zoom Shortcut Key : Ctrl + 0

You can use the simple keyboard shortcut to get back to the default page size of a pdf file in the firefox browser.
Press and hold Ctrl and 0 together, to resize the page to the default size.
Use this shortcut, after using zoom out or zoom in option.
As a result, your image will look as we have shown below.