There've been reports that the preview fails to install/run correctly if you're using a 32-bit version of Windows 8.

Also, can you look in the "All Apps" list that you can access by right-clicking a blank spot on the start screen and choosing "All Apps" from the bar that appears, and see if Nightly shows up in there?

It also requires the RTM version of Windows 8, so if you're trying to do this from the release preview, it probably won't work...

A final thing to check is the default program settings. Go to the start screen, and start typing "default", then choose "Default Programs" from the list. In the window that pops up, click "Set Your Default Programs". In the list of programs, select "Nightly", and then click "Set this program as default" to give it all of the defaults. Then go back to the start screen and see if the tile appears there.

i download the lastest nightly build 19.0a1 when i changed the default program into nightly, it's still open in desktop mode. is this a nightly bug ?

It isn't yet in the normal Nightly builds, you'll have to download the Metro Preview build: http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-elm/firefox-18.0a1.en-US.win32.installer.exe

Beyond that, the Metro version will only open from the tile on the start screen, and only if it shows the new icon on the tile.

Not Found

The requested URL /pub/mozilla.org/firefox/nightly/latest-elm/firefox-18.0a1.en-US.win32.installer.exe was not found on this server.

) Help me please

Oh. Sorry, we're up to Firefox 19 now: http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-elm/firefox-19.0a1.en-US.win32.installer.exe

The Nightly Channel has been 19.0a1 ever since October.9 build.

)

i already download it i used win 8 pro x86, but it doesn't open in metro preview i don't know why :/

As you have 32-bit Windows and not 64-bit, you may be able to run it in desktop mode but not in Metro mode.

so this isn't a bug, but the system only for x64 ?

'(

i hope can open firefox in metro mode for x86

I've installed the lastest nightly build on Windows Pro x64, and it does NOT open in Metro mode on the start screen. Regardless of how I open it, it reverts to desktop mode. Any suggestions?

Try to add the -metrodesktop switch. "C:\Program Files\Nightly\firefox.exe" -metrodesktop

I added the -metrodesktop argument from command line and got the same result. Nightly is installed in the Program Files (x86) directory. Is there a 64-bit version that I need?

it's doesn't work, maybe someday can be fixed

I need a solution to Nighlty, the metro don't work, th4nks

See also:

• http://forums.mozillazine.org/viewtopic.php?f=23&t=2304983

Only set nighly into default, then nightly turn into windows 8 modern ui. done