Using Firefox (Nightly) as Full-Screen Metro App in Windows 8

Mozilla scrapped the palns of making the modern app. Hence, the procesdure in the article will no longer work.
Windows 8 introduced the new clean and minimalistic Start screen and the support for Modern (Metro) apps. As a Windows 8 user, you’d be already knowing that Metro apps run in full-screen and hence don’t waste any screen real-estate. Metro apps however being super minimalistic, do look cool and are much easier to use, especially if one owns a touch based PC/Laptop/Hybrid.

Firefox is not immediately available to be run as a Full Screen metro app, but Mozilla Firefox Nightly which is currently a test platform can be used as an alternative. The Windows version of Mozilla Nightly can not only work as a standalone desktop browser (a replica of Firefox), but it can also be run as a Full-Screen Metro App. Here’s how to use it in the Metro app mode.

Nightly Logo

Download and Use Mozilla Firefox Nightly as Metro App

  1. Download Mozilla Nightly (Windows Desktop version) from here
  2. Extract and Install it. I’ll skip the installation instructions, because they are all same as regular Firefox.
  3. Click on Start (at the lower left corner) or press the Windows Logo key. Type Default Programs and hit enter.
  4. From the Default Programs window, click/tap on ‘Set your default programs’.
  5. Select Nightly from the list in the left sidebar and click/tap on ‘Set this program as default’.
    set default program win8
  6. The status above will change to This program has all its defaults.
  7. The Nightly tile in the Start screen will change from a simple tile to an advanced tile with a globe with background of stars.
    Desktop vs Metro Enabled Tile
    Desktop vs Metro Enabled Tile
  8. Click or Tap on this tile to run Mozilla Firefox Nightly in the Full-Screen Metro App mode.
    Firefox Nightly Metro Mode
    Nightly running in Metro Mode

That’s it. You can only run the browsers in Metro App mode if it is set as the default browser. So if you set Nightly as your default browser, Internet Explorer won’t open in Metro Mode and clicking on the Tile will open it in the regular desktop mode.


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    • Not anymore, unfortunately. Firefox scrapped the plans to make a metro (modern) app and the functionality was removed from nightly even before it could reach Firefox stable.

      • Ah, I see. So, this is the Metro functionality, actually. I saw that the development was stopped but did not realize that this was how it was to be enabled.

        In any case, there is Fullscreen functionality in Firefox that produces similar effect. The only issue I have with that is that it is difficult to get out of fullscreen, once enabled.

        • The metro version was a lot cleaner. There were only a few options and was a perfect browser to have on touch enabled devices (Windows 8 tablet?), but for some reason, the Mozilla dev team never managed to make a stable version of it and was finally scrapped claiming that there are not enough users of the same.
          Full screen helps, but it is still the same browser taking the full screen. Pressing F11 to enable and then get out of fullscreen isn’t much of a hard thing though 😛

          • “Pressing F11…”

            True, but it’s hard to get to F11 on a tablet with the browser in fullscreen. 🙂
            If I was to judge by the quality of apps in Windows Marketplace and the state of development of those, I’d have to conclude that Windows is doomed as a tablet OS.

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