This is way too basic. I would like to browse/manage/edit my reading lists from the app in the browser. All you can do is add articles to an "invisible" reading list and then find them in the app

There is literally no way to view your reading list or remove entries. All you can do is click the icon to add articles to the default list.
That isn't helpful at all! Why does this even exist? Just another Wikimedia Foundation project that nobody asked for.
Do they really expect users to add entries on PC and then open the app on your phone to view or delete entries?
You already implemented the sync feature, which is far more complicated. So, why don't you go all the way and add editing and viewing to the browser extension?

i really needed this.
i can sync my Wikipedia app list to PC , Perfect.
i think you should log in to Wikipedia site and tick "remember my log in".

Doesn't work. Says I need to login, but the login button does nothing, so I can't.

Only allows syncing to reading lists, not viewing them. To do that, you need to use the app. Wikimedia really needs to implement a proper article saving feature that works across both the app and the web versions of Wikipedia.

Great idea if it actually worked. I get an error every single time. I'm logged in and nothing. Just non stop errors.

Great idea for an add-on, but it doesn't work. I have tried it on Linux, MacOS, and Windows, and had no success on any platform across three different machines.

Good, works for me, but a even a bit more than it should – I could put on the reading list even my Wikibooks watchlist. (The app couldn’t open it, of course, although it had no problem with the Wikibooks main page, except for that it wanted to open every internal link in the browser.) Also, a notice would be good which would show if a page is on the reading list.

I have high hopes for this add-on. However in the current version it only displays a "login" button redirecting me to the Wikipedia login page, whilst I am already logged-in on Wikipedia. Even a logout and then pressing this button doesn't makes this add-on recognizing that I am already logged-in.