Rated 3 out of 5 stars

Ohnoliska, it's not a problem with 3.6.13. I tried downgradning to 3.6.12 and the problem persisted. A review on 1-Click YouTube Video Download said that YouTube has recently implemented new code. If this is the case then it would explain why all the YouTube downloading extensions are suddenly having problems. It also means that they all need to be updated ASAP.

This review is for a previous version of the add-on (4.8.1).