MUST ALWAYS GET Firefox version 3.6.23 if get any higher than 3.0 will result in a 100% unpredictable BLUE SCREEN.... so keep to Firefox 3 never GO HIGHER
List of items (also meaning addons and plugins):
1. Firefox 3.6.23 (or earlier)
2. NASA Night Launch (Firefox Dark Theme- PRO always get it)
3. AdBlock Plus
4. Xmarks (Firefox Sync addon)
5. Flash Video Resources (downloads flash aka youtube or whatever)
6. Flash Video Downloader - Youtube Downloader
7. NetVideoHunter
8. Download YouTube Videos as MP4 and FLV (yes there is an addon called that)
9. Download Flash and Video (addon)
10. Photobucket Uploader (if you have photobucket ofc)
Also get HTML5 (I think) to get lots of extra features: http://www.interoperabilitybridges.com/html5-extension-for-wmp-plugin