Rated 5 out of 5 stars

edit Dec. 2nd, 2015 -- OK: updated to version 5.6.44: working again. Thank you for the fix.
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Version 5.6.32: as of Nov. 15~16th 2015, "Uncompressed Wav CD quality" and many other download (high quality) formats are not available anymore... I get a "zero byte" file. "Plus" 32-bit Firefox 37.x and 40.x now warn: "CYS unverified module"...

This review is for a previous version of the add-on (5.6.32). 

We are working on a fix...an update should be ready soon...

11-19-15 Update: Download v5.6.44 here: https://addons.mozilla.org/en-US/firefox/addon/complete-youtube-saver/versions/