Configuring it is super counter intuitive. I have a paid hosting on app.wallabag.it and yet setting up the addon needs to create a client on the website, pasting it back on the addons settings page and still entering the password anyways, or maybe not, very unclear. I then realized that before setting it up it was not saving anything. So I just LOST all the pages I bookmarked before figuring out how to connect the plugin to my account. And the wallabag plugin doesn't indicate in anyways that it is linked to a server or not. No color change, no error messages. So I was just casually bookmarking pages with the idea that they were getting saved....But they are gone. Now that I linked to the server, I was hopping that it would sync a kind a local buffer, but no luck with that.. Wallabag is great, but the Firefox addon is just crap.