**SCAM** Downloads non-functional, 0 byte videos. Apparently the developer has abandoned support for this add-on but is still accepting donations. I recommend using Video DownloadHelper or Youtube Downloader, both of which (at the time of this writing) are functional and free.
Pls. update to latest v 15.7, whenever youtube changes code every downloader out their breaks. This time it took longer for me to fix and then ever longer for mozilla to review and approve the update. If you find the addon working again, pls. re-rate the extension :)
