Yeah, if you turn it all into buttons and settings in the actual settings menus, someone else is going to post a long rant about how the settings menus have a million confusing options that nobody uses...

Mine also isn't anywhere nearly as confusing as his by default, so this smells like a power-user-has-power-user-problems-and-solutions rant...

  TMPPROF="$(mktemp -d /tmp/ff-tmp.XXXXXX)"
  /Applications/Firefox.app/Contents/MacOS/firefox -no-remote -profile "$TMPPROF"

I'd suggest that they make it clearer what the user actually changed, in about:config, and show the defaults. If I click that button "Show only modified settings" I see a lot of things, mostly options that I set from the normal settings. I mean "browser.download.lastDir" should be in practically everyone's.

So there's a lot of noise and resetting things can be unclear. Especially given that when you reinstall things not all uninstalls clear out settings. It could definitely help if the about:config page tells you about the user.js file and directs you to more information. Why doesn't editing things in about:config generate the user.js file? Maybe tell people about prefer.js and where it exists?

The other thing I'd suggest, documentation. Like what is "browser.translations.chaos.errors"? There's a million things like that that are hard to learn about and explore. In an ideal system there would be a wiki with every option documented and when hovering over the option you'd get a short explanation and a click is a link to the documentation. But that's also a big undertaking (if you're building a new browser, would be nice to do this from the get go!)

I don't think there's a perfect solution and certainly these things are not easy to implement, but if you're asking how it could be easier for the user, then yeah, I think these things would be major improvements and help prevent the blindly following of random blog posts and copy pasting of things like betterfox (I'm sure it is, but how do I know?)

The toolbar has a "Customize toolbar" GUI screen that lets you add, remove and reorder elements. Maybe something similar could be done for context menus, including new entries added by extensions.

Have you ever right-clicked on the toolbar and chosen "Customize Toolbar..." ?

Something like that.

there is a middle ground where you could do something like about:mouse (about:keyboard for keyboard shortcuts already exists) for the power users. doesn't need to be fancy but it would be easy enough to do.