Problem with 'Enqueue for Download' (Posted on: 12 January 2013)
Recently there have been some changes in the Firefox extension API. After these changes, the 'Enqueue for Download' option is not working properly. It throws some exceptions and the videos fail to get downloaded. I am working on this problem. Meanwhile please use the 'Generate Links' option and use a download manger such as DownThemAll to actually download the videos. For this same reason, eventhough the problems caused by YouTube changes (on 19th Dec 2012) have been resolved, I did not upload the fix on amo.mozilla.org and so the users will not receive the fix automatically. Please install the dev-version 1.1.2a1 to get rid of this problem.