IMHO, installing and loading extensions should be described before the Structure section, which is interesting for extension developers but not for extension users.
I guess pipx has to be mentioned quite early in this page, with a simple example (maybe xpip install xontrib-vox).
I'd just like to mention that the page https://xon.sh/tutorial_xontrib.html could be improved for user perspectives.
IMHO, installing and loading extensions should be described before the Structure section, which is interesting for extension developers but not for extension users.
I guess
pipx
has to be mentioned quite early in this page, with a simple example (maybexpip install xontrib-vox
).