Ricardo / IMDb "My Movies" enhancer

The script is not working for me at all.

In function loadMyMovies() after var userData = localStorage.getItem("myMovies-"+user); userData is null.

Inspecting localStorage with Firebug, it looks like I have nothing in localStorage except for one entry IMDbAdvertisingFrequencyCapping.
There's just some stuff in sessionStorage.

I am properly logged in and I do have a bunch of lists.

I am using Firefox 44.0.2 (up to date at this moment) with Greasemonkey.

Any ideas?