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→Desktop Launch
Note on the desktop we use the desktop's Win32/Widget backend. This can behave differently from the Win8 WinRT backend. The translational layer for Win32 events is location in /browser/metro/content/base/input.js.
=== Running Desktop and Metro Simultaneously ===
It's possible to run desktop Firefox and Metro Firefox side-by-side by using different profiles. However, there are some problems caused by the fact that Metro Firefox will only use the default profile ({{bug|945511}}), and our startup code will always start in desktop mode if any desktop process is running ({{bug|945554}}).
Here's one way to keep desktop Firefox running while testing Metro Firefox in a separate profile:
# [https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles Create a new profile] named "desktop". (You can use Firefox Sync to keep this in sync with your default profile.)
# Launch desktop Firefox by running <code>firefox.exe -p desktop -no-remote</code>. (You can create a [http://kb.mozillazine.org/Shortcut_to_a_specific_profile shortcut] to make this more convenient.)
#* If you are making changes to the Metro Firefox source code, it's useful to start desktop Firefox from separate installation rather than your objdir, so you don't need to close it each time you rebuild.
# Launch Metro Firefox by running <code>firefox.exe -no-remote</code> (or <code>./mach run</code>) and then press the ''Windows 8 Touch'' menu button to switch to Metro.
#* Or you can launch the Metro UI in a desktop window by running <code>firefox.exe -no-remote -metrodesktop</code> (or <code>./mach run -metrodesktop</code>).
=== Testing ===
