You could use something like Omnivore for this (it's what I use), is free and open-source and have apps for iOS and Android
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It needs Firefox Beta or Nighty to be installed, right?
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Annoyingly, Pocket requires a separate install on android, but it's built in on desktop and is able to do this.
I also use OneTab for this kind of functionality, it let's me save all the tabs or specific ones to go through later.
Just as a side note -- if the user is ok with (or actually prefers) handling the archival & indexing of the material himself/herself, SingleFile works great as a 'read later' tool. It can save into a WebDAV share; can be imported into a self-baked minimal webextension as a library; & has an almost feature-complete mv3 port.
Works on Fennec (based on FFox Beta, I think) though a bit slow, unfortunately. Available otherwise on desktop FFox & Chromium.
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