Arthur Article Saver от Oleh Vdovenko

Arthur saves the rendered article in the active tab as clean Markdown.

It works without an account, analytics, advertising, telemetry, or remote backend. With the extension alone, Arthur downloads the article as Markdown and leaves media as remote links.

On macOS, Arthur can optionally use its separately installed native helper to write Markdown and browser-retrievable attachments directly to the folder you choose.

Arthur reads a tab only after you click its toolbar button. Your saved articles remain on your device.