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You can just save the pages in MHTML format (so each page is a single file) and keep them in "read later" folders. Or you can use one of the services that saves pages online....

Evernote clipping a page rather than just bookmarking it would work if it's static content.

I used Scapbook forever, but started recently using:

https://github.com/danny0838/firefox-scrapbook/wiki/Features

Holy smokes thank you for this link! I have been looking for a page archiver that would actually pull down ALL the files needed for a page and fix the relative links. All the others I have found simply ignore css includes like fonts or css images.

This one works great!

Finally!!

Another option is the Firefox "Print Edit" Addon. It allows you to remove any unwanted stuiff from the webpage and then save it as a single file (or print it). This will include all the CSS, Javascript and raster-images as base64 encoded data-urls. What you gain, in the end, is a single HTML (not MHT) page, that contains all the requisites and has crap removed (by you).