You’ve installed Swiftfox and you’ve got no sound while playing flash videos ? If you’re an Ubuntu user don’t bother yourself with the myriads of proposed solutions and install the flashplugin-nonfree-extrasound package.
Swiftfox is a closed source app, there’s an excellent open source alternative : Swiftweasel, give it a try it’s as fast and lightweighted. For Mac users try Camino.
Both of this two apps can be translated using the official Mozilla language files, go to this url:
http://releases.mozilla.org/pub/mozilla.org/firefox/releases/
Select your version and check /linux-i686/xpi/ click on your xpi language file and it will install automatically.