Can also be launched from about:profiles, which can't be bookmarked, so, yeah.
Firefox has useful about:about pages.
With some revamp they could capitalize on some of them much more. After newtab, the last addition was "Firefox View" for recently closed tabs or synced tabs. I'd wish the same for history, bookmarks and downloads. Those very much show their origin as sqlite browser.
OH! this is super clever after a decade of me typing about:config and other that I never remember completely ! this is so much easier ;p
Actually, it would be kind of awesome if the URL bar really could act more like a command line for the browser. Hmmm.