May 11 2020, it's working again!
Jan 12 2022, stopped working. Went back to earlier version, but now it doesn't combine files.
Dec 2022, not combining files. Looking for something else. March 23, no longer combines audio and video.

Two other add-ons and an application to install just to download a video or convert one? Streamline it or warn people. Do better. Uninstalled.

6 months ago:
[published_date] is always as "undefined" in file name.

Today: [published_date] still not working.
Also cant use '[' , '(' and other special symbols in the file name.

The downloader is fine. I want to know why the god damned preferences page opens every time I download something!

No sound after downloading 420p video.

Quick download option downloads only a low-res video even if you are watching the HD version playing in your browser. Does not display high bitrate download options for videos. Audio is downloaded separate from videos.

I'm trying to install native client (from link on github.com ) in kali linux 2020.1 , firefox 73.0.1 - after command ./install.sh(everything fine) still doesn't see as installed in YouTube Video and Audio Downloader settings tab.... I'm upset

No proper funktion since the last days ... HOPE for update soon!?

This was a 5 star add-on until this latest update. Now I get this error:
signaturelocal: cannot resolve signature;3

All of a sudden, it flat out doesn't work. I guess either a bug was introduced or Google eliminated direct downloads period, not just in their own store.

Have uninstalled and reinstalled the extension, cleared cache, refreshed Firefox, etc Still no joy.

Would rather not be forced to pay for a separate downloader to get the functionality I had as little as a day ago.

UPDATE: 05/07/2020
Now the new error is "Type error for parameter options (Error processing url: Expected string instead of undefined) for downloads.download.

Went backwards to FF 75 from 76 and the same error.