Mozilla has just released the latest version of their web browser, Firefox 28. The update is available immediately for Windows, Mac, and Linux users. There's several new features in the update. For example it now has volume control for HTML 5 audio and video and VP9 video decoding is now supported. Mac users will be happy with the addition of Notification Center support. WIth the update web apps and websites that use Firefox's web notifications center will now appear in the Notification Center on Mac computers. The updated browser also includes some bug fixes.