Until recently, one could conveniently download Mozilla's developer's documentation, developer.mozilla.org.tar.gz, for offline reading. However, Mozilla seems to have upgraded the documentation to a new, SQL-based format, abandoning the old TAR.GZ.
One does not doubt that such an upgrade is good, but I do not understand the upgrade, so now I am confused. How should I now read Mozilla's developer's documentation offline?
REFERENCES
Below seems dead, here's how to do as of https://kapeli.com/mdn_offline (mentioned by deleted answer below):
Offline MDN Docs
You can download the MDN docs using the table below. Before downloading, please consider using a documentation browsing app like Dash (macOS), Velocity (Windows) or Zeal (Linux) instead. These apps will help you get the most out of the docs, by providing a search index and quick access to everything you need.
CSS.tgz 1 December 2020 HTML.tgz 1 December 2020 JavaScript.tgz 1 December 2020 Note: Includes DOM docs SVG.tgz 1 December 2020
It is advertised.
https://developer.mozilla.org/en-US/docs/MDN/About#Downloading_content states
Downloading content
You can download a full tarball mirror of MDN.