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.