bug 763491. Change string to say "Firefox version 15" instead of "Firefox version 14," since WebappRT will first be released in version 15. r=myk

webapprt/win/webapprt.cpp

@@ -511,7 +511,7 @@ main(int argc, char* argv[])
   }
 
   // We've done all we know how to do to try to find and launch FF
-  Output("This app requires that Firefox version 14 or above is installed."
-         " Firefox 14+ has not been detected.");
+  Output("This app requires that Firefox version 15 or above is installed."
+         " Firefox 15+ has not been detected.");
   return 255;
 }