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Firefox and Thunderbird install an optional service called the Mozilla Maintenance Service which allows application updates to occur in the background, without requiring you to click in the Windows User Account Control (UAC) dialog.

When Firefox or Thunderbird downloads an application update, the Mozilla Maintenance Service gets permission from Windows to allow the update to be applied, without requiring you to click in the Windows User Account Control (UAC) dialog. Until that time, the service doesn't run so it doesn't use any computer resources and, once the update process begins, the service quits.

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Want more technical details? Check out the Mozilla wiki.

If you'd like to be prompted to authorize updates, you can disable the Mozilla Maintenance Service as follows:

Firefox

1. In the Menu bar at the top of the screen, click Firefox and select Preferences.Click the menu button and select ...
2. Click the Advanced panel.
3. Click the Update tab. The update options are displayed.
4. Uncheck the box next to Use a background service to install updates.
5. Click to close the Options window.Close the about:preferences page.

1. In the Menu bar at the top of the screen, click Firefox and select Preferences.Click the menu button and select ...
2. Click the General panel.
3. Scroll down to Firefox Updates. (Tip: You can also search for updates in the search box.)
4. Uncheck the box next to Use a background service to install updates.

Thunderbird

1. At the top of the Thunderbird window, click the Tools menu and select OptionsIn the menu bar, click the Thunderbird menu and select PreferencesAt the top of the Thunderbird window, click the Edit menu and select Preferences, or click the menu button and choose OptionsPreferences.
2. Click the Advanced panel.
3. Click the Update tab. The update options are displayed.
4. Uncheck the box next to Use a background service to install updates.
5. Click to save your changes and close the Options window.

You can uninstall the Mozilla Maintenance Service from your computer, if you wish.

• Windows XP: See Microsoft's article, To change or remove a program.
• Windows Vista: See the Microsoft forum thread, Add/Remove Programs in Windows Vista.
• Windows 7: See Microsoft's article, Windows 7 – How to properly uninstall programs.
• Windows 8: See the Microsoft Community forum thread, How do I delete or uninstall a program in windows 8.
• Windows 10: See Microsoft's article Repair or remove programs.

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Our mission is to keep the Internet open to innovators, creators, and builders on the Web. Virtual Reality is set to change the future of Web interaction. The ability for anyone to access and enjoy VR experiences is critical. This is why Mozilla set out to bring virtual reality to Web browsers, and why we are enabling WebVR in Firefox.