Stopping Firefox's restore session dialog

I’m sure that there are Firefox users out there who want to restore their previous session; I never do, and so deactivating that dialog is a big timesaver. If you search, you’ll find a few writeups on how to adjust the configuration, but I want to document the minimum steps to suppress the restore session dialog.

1. Enter about:config into the URL field.
2. Enter sessionstore into the displayed filter field and press Enter.
3. Double-click the value cell of the browser.sessionstore.enabled row, so that the value field reads False.
4. Restart Firefox. One click saved.

[ T: Firefox ]