With the old website code, there was an extension (userscript) which enabled the ability to view how many skills/lessons are left in the course. Because of the website rewrite, it won't display the remaining lesson amount anymore, and there doesn't seem to be a newer version of it.

I was a little disappointed too when I ran into the same issue. Now I have found that Duo periodically sends me an email letting me know how close I am to my next level. I haven't worked out whether it's a coincidence or not but the status seems to usually be sent if I delay in starting my daily practice until later in the 24 hr period -- for example waiting till 8pm/9pm in the evening.

whats the extension called?

I am trying to go on with the skills. finished the skill of abstract objects. how can I open the rest