Works flawlessly with my self-hosted wallabag.
As a [feature request], I would gladly have a darker theme (optional ?) for the popup used to add a page.

I have the same issue as another reviewer. The addon installs and tries to check the URL I typed in, but "Wallabag URL checked" remains at "Not checked" although "Wallabag permission checked" changes to "Agreed."

Clicking the toolbar button throws an error, "api.GetTags().then is not a function."

Wallabag itself is working fine. I'm using a self-hosted Wallabag instance - Wallabag is hosted on my NAS which is on the same LAN as the machine running Firefox and the addon. I can access the Wallabag instance from my laptop and save articles with it, but the addon stops at the "Wallabag permission checked" step like described above, unfortunately :/

So far works good, LibreWolf 116.0.2-1. Let's see how it behaves in long term. Registered, created API token, pasted everything needed in the extension and voila. Setup took less than 5 minutes. Easy peasy even for a noob.
The instruction in extension description is more than enough for setting it up using the wallabang instance.

takes forever to save an item

Review after developer response:

The url provided in the developer's response fixed my issue, but this addon is still far, far too complex to set up for the average user.

Previous review:

These instructions don't make any sense if you're a paid subscriber. The firefox addon asks for a url, and none is provided in the instructions. I tried https://app.wallabag.it/ (since I'm a paid subscriber) and the options page still says 'url not checked' so I can't get this thing to work.

Can't get it to work with Firefox 107. It tries to check the URL (which is correct) but "Wallabag URL checked" remains at "Not checked" although "Wallabag permission checked" changes to "Agreed."

Clicking the toolbar button throws an error, "api.GetTags().then is not a function."

Meanwhile, Wallabag itself is working fine, so I don't think the problem is there.

So far great, easy to setup

Wallabagger is a great extension that help making the most of a Wallabag instance. Once the initial setup done (which needs Wallabag login & password plus an API client ID & secret Key from your Wallabag instance), the extension works seamlessly.
Wallabagger has a great UI, and is very easy to use. A must have for all Wallabag users.

I have been using Wallabag for a long time. This extension will not save pages to my account after the configuration.