COLLECTED BY
Organization: Internet Archive
Focused crawls are collections of frequently-updated webcrawl data from narrow (as opposed to broad or wide) web crawls, often focused on a single domain or subdomain.
Collection: mozilla.org
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20151015215623/https://developer.mozilla.org/ja/docs/Web/JavaScript/About_JavaScript$json