Firefox: Weakening platform restriction to enable 64-bit support

Author: barancev

javascript/firefox-driver/extension/install.rdf

@@ -23,7 +23,7 @@
         <em:targetPlatform>SunOS</em:targetPlatform>
         <em:targetPlatform>FreeBSD</em:targetPlatform>
         <em:targetPlatform>OpenBSD</em:targetPlatform>
-        <em:targetPlatform>WINNT_x86-msvc</em:targetPlatform>
+        <em:targetPlatform>WINNT</em:targetPlatform>
         <em:targetPlatform>Linux</em:targetPlatform>
 
         <!-- We're probably missing lots of platforms here -->