Video downloading extensions for Firefox?

Hiya,
I am looking for an extension for Firefox so I can download videos from webpages such as YouTube, Google video, MySpace etc. I am really not sure what to do for a couple of reasons;
1.) I'm not sure if they are illegal or if using them to download videos from these sites would be illegal, and I don't want to do anything against the law. I am confused, as common sense tells me it must be illegal, yet the extensions are listed on the official Firefox Add Ons site, so why would they endorse or allow something that encourages people to violate copyright?
2.) If they are legal, I don't know which one to get, there are about a dozen on the Mozilla Add Ons site. I'd like to hear from anyone who knows one that works and is easy and secure to use.
Can anyone advise me on these two issues? I'd be most grateful, Thanks.

I am more familiar with extensions than plug-ins. I'm not actually sure of the difference between the two.
I can't say what file type exactly, as I'm getting it so I can download useful videos I find in the future, so I'm not sure which type now. All I can say is I am interested in the sites I mentioned in my first post.
Here are links to the extensions on the Firefox Add-Ons site that I'm looking at. As you can see, with ten extensions avaliable to download videos, I am confused as to which one to get (and also as to whether their use is legal.)
https://addons.mozilla.org/firefox/2390/
https://addons.mozilla.org/firefox/2584/
https://addons.mozilla.org/firefox/201/
https://addons.mozilla.org/firefox/2838/
https://addons.mozilla.org/firefox/2254/
https://addons.mozilla.org/firefox/1468/
https://addons.mozilla.org/firefox/1925/
https://addons.mozilla.org/firefox/1992/
https://addons.mozilla.org/firefox/1993/
https://addons.mozilla.org/firefox/627/
iBook G4 12 inch Mac OS X (10.4.5) 80 GB internal Hard Drive

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