Another idea:
Subscription channels. You subscribe to a set of articles ( category,
or "this article and all articles that link it"). if you are on-line,
a robot slowly mirror these categories as static files on the hard
disk. (update if changes are made, download if there are new).
Make so this extension open a sidebar, where you can browse your
offline categories, and open one of these, make so If you click on a
link that is not mirrored, a popup ask "This article is not saved
offline, do you want to add to this category?".
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ℱin del ℳensaje.