I am a hobbyist in computation, but not clumsy, an d I still spent 30 minutes setting up the addon. Some comments

1. the link on how to set it up takes to google-chrome, which is not the best. Within that doc the link in "First of all you have to create a new client on your wallabag installation. How to do that is described in Documentation" is not working. Anyhow, I managed to do the client.

2. While setting up the addon preferences (nice that it takes you there when error in import) I didnt know what to write in wallabag url. I assume this option is necessary for self-hosted (I have no idea), but when I tried at first the default app.wallabag.it it wasn't checking Ok. I spent all the time up and down your documentation to find the app url, assuming it was related to client; stupid me I even tested the one in your example "v2.wallabag.org", and I think that finally restarting firefox changed something in cache or whatever that captured the default url as a correct one.

3. A Youtube/vimeo video would be helpful.