Streaming video doesn’t work without an active Internet
connection. No Net equals no Flash video, so sites such as YouTube
are off-limits. Easy YouTube Video Downloader to the rescue: This
Firefox add-on allows you to download Flash movies from YouTube and
other sites for later viewing with or without your connection. In
addition to all the free clips, you can find free versions of full
movies such as Ghostbusters on YouTube.
Note: This link takes you to the add-on’s page
at Mozilla.org, where you can automatically install the file into
your Firefox browser.