Wallabag is an adequate substitute for Pocket, being fully open source, and with the ability to self host it if you don't want to trust the two main hosted instances.

It's not quite as slick as Pocket, but I find that goes for many, otherwise perfectly usable, open source equivalents for commercial products and services. What let's it down though it the complexity of configuring the add-on with your account credentials.

The instructions could be clearer as to what to do exactly when you have an account with

1) framabag.org
2) wallabag.it
3) self hosted

While self hosting is beyond the skills of ordinary users, many users of the aforementioned hosted instances still won't have a clue what an API is or how to set up a client.

I could not give Wallabag and the Wallabagger add-on to my family and most of my friends, without having to do the configuration for them. With Pocket no such problem.

This is a pitfall of many open source products, many of which are created to scratch an itch for the developer, who by definition is technical enough to not need a user friendly UI.

As this add-on works well, once configured, I've only docked one star; more hand holding for novice users and a slicker presentation and overall experience is all that stops this from earning a fully 5 star rating.