How do I set Home screen/page to About Firefox?
In previous versions of Firefox this was done by setting the Home screen URL to " about: ".
I am running Firefox ver. 71.0 (32bit) in Win7 Pro.
Use "about:about" or whatever.
The about: page was removed in Firefox 59. The about:about page shows all available about: pages, so you can use this page like posted above or another about page listed on this page or use a lank page as the Home page.