It stopped working for photos that are not "safe", i.e. it does not work for "adult" content.

Apparently I'm the only one who, unfortunately, this add-on does not work. It used to work for a long time, then it stopped. I noticed that when I reinstall the browser and go to Fliskr for the first time after that, the add-on works, and then, for some unknown reason, it stops working.