CWmike writes "Taking a page from rival Google's playbook, Mozilla plans to introduce silent, behind-the-scenes security updating to Firefox 4. The feature, which has gotten little attention from Mozilla, is currently 'on track' for Firefox 4, slated to ship before the end of the year. Firefox 4's silent update will only be offered on Windows, Mozilla has said. Most updates will be downloaded and installed automatically without asking the user or requiring a confirmation. 'We'll only be using the major update dialog box for changes like [version] 4 to 4.5 or 5," said Alex Faaborg, a principal designer on Firefox, in the 'mozilla.dev.apps.firefox' forum. 'Unfortunately users will still see the updating progress bar on load, but this is an implementation issue as opposed to a [user interface] one; ideally the update could be applied in the background.' Unlike Google, Mozilla will let users change the default silent service to the more traditional mode, where the browser asks permission before downloading and installing any update."