Many Firefox users were excited to hear that Mozilla has made available a new Firefox (Metro) Nightly version, specifically designed to take advantage of Windows 8's chromeless interface. However, many users are reporting on various websites and forums that the new Metro version of Firefox does not work when they try to launch the Nightly tile from the Start screen. Instead, the standard version of the browser launches.
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How to reset Mozilla® Firefox if it won't open on Windows® 8.1
Of course, we all know that the latest version of the open source software is still in its early stages and there are still many bugs to be fixed. No one should expect this Metro version of Firefox to run perfectly, but you should at least be able to get a taste of it.
Like many of you, I have encountered this issue, but after doing some testing and trying to explore alternative options, I discovered that Firefox Metro is currently having some conflicts with Internet Explorer 10 and for some reason is not properly registering as the default browser.
If everything you've tried hasn't fixed the problem, the last thing you can try is disabling Internet Explorer 10 in Windows 8. This solved the problem for me and I think it will also work for users who want to test the latest version of Firefox.
