Did you intend to be using Firefox 3.0 beta 5? This is an extremely outdated version of Firefox. If you think you are using the latest version: *Type ''about:config'' in the URL bar and hit Enter *If you see a warning, you can confirm you want to proceed. *Filter = '''general.useragent'''. *Right-click the preferences that are bold, one line at a time, and select Reset, *Then restart Firefox Make sure you are using a supported version of Firefox by upgrading from http://www.getfirefox.com ----- You're using an old version of the Flash plugin, which can cause problems. First update your installation of Flash. See [[Managing the Flash plugin]] ----- What is the problem exactly? You can't open sites? Or just that YouTube videos won't play, or both? See [[Error loading websites]].