Open Google Maps, drag yellow guy at some place, when the picture is loaded click the addon icon, then press F11 key and take a screenshot with PrtScn key to get a wallpaper!
I recommend ShareX for screenshots but Paint will do the job of course.

Install

• License: MIT License
• Weekly downloads: 7
• Average daily users: 30
• Rating: 5/5 of 2 ratings
• Created: 2019-12-14 17:11:10
• Last updated: 2019-12-14 20:45:10
• Homepage:
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/mapswallpaper/
• API: {c492de7b-91b9-4a83-a230-ab02ff11d16c}