Extensions
One page per extension, in the order the catalog lists them. Every page opens with what you can do with it, then how to try it, then one reference half — the commands, the keys, the limits, and the settings worth changing.
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The template every page follows is
CONTRIBUTING.md.
A name you half remember — /browse, read_doc — is in
Tools and commands, which lists every one with the page
that owns it.