We have recently updated our Firefox Add On.
The main new feature is that it the statusbar icon will now flash whenever watching a YouTube video to let you know that you are able to download it.
As Mozilla Add Ons seems to be pretty busy these days, they haven’t gotten around to testing and approving it for public release yet. You can download it here:
https://addons.mozilla.org/en-US/firefox/addons/versions/12642
Don’t be afraid, just check the checkbox to allow you to download it! 
The version history is shown below:
Version 1.0.1
Fixed issue with flashing not working correctly in Firefox 2.0 – 3.0
Version 1.0
Statusbar icon now flashes when video download is available.
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Tags: firefox add on, firefox plug in, youtube video downloader, youtubekeep add on
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keep it up!