User Agent: Mozilla/5.0 (Windows NT 6.1; rv:20.0) Gecko/20100101 Firefox/20.0 Build ID: 20130409194949 Steps to reproduce: Once the new Firefox version was installed (20.0.1) all my download ADD-ONS stopped working properly. I was trying to download a video from YouTube using two different ADD-ONS: 1. Download Flash and Video 2. Download Helper ( https://addons.mozilla.org/en-US/firefox/addon/download-flash-and-video ). ( https://addons.mozilla.org/en-US/firefox/addon/video-downloadhelper ). Actual results: Both ADD-ONS failed and downloaded from YouTube the wrong video. Something is wrong with the new firefox version.
Please note that addons are the ones built taking into account the Firefox versions, and not viceversa. You should report this to the addons developers also.
I tried to download a Youtube vid with VDH and FF 20.0.1, no issue. Just reinstall the add-ons, maybe.
WFM per comment 2
It works fine with current versions. Bug closed.