On Mac OS X, when user
- has Java Plug-in 7u6
- does not have JavaFX runtime ( can simulate this case by corrupting the jfxrt.jar)

and load the DT enabled JavaFX 2.2 applet

1) On Firefox 10.x+, message displayed "JavaFX application could not launch due to system configuration. See java.com/javafx for troubleshooting information"
which IS the correct expected behavior

2) On Safari 5.1.6, there is no such message at all. In fact, nothing displayed at all on Safari- no expected message as in the Firefox case

*** Test Configuration:
- Mac OS X 10.7.4
- Browser: Firefox 10.x+, Safari 5.1.6
- Java Plug-in 7u6-b09

*** Steps to reproduce:

0) Install Java Plug-in 7u6 -b09
http://jre.us.oracle.com/java/re/jdk/7u6/promoted/all/b09/bundles/macosx-x64/JavaAppletPlugin.dmg

1) Make sure the installed Java Plug-in registered correctly with Firefox and Safari

2) Rename jfxrt.jar included in the above Java Plug-in 7u6 under /lib

3) At this point, it is the same case as user does not have JavaFX runtime installed

4) Use Firefox to invoke the JavaFx 2.2 DT enable applet
http://jfx.us.oracle.com/hudson/view/2.2/job/2.2-deploy-scrum/66/label=macosx-universal-14/artifact/artifacts/deployed/dtTests/JSPreloader.html

You should see the message: "JavaFX application could not launch due to system configuration. See java.com/javafx for troubleshooting information" which is correct behavior

5) Use Safari to invoke the same applet in step #4
and if you don't see the message as in step #4 and nothing happens at all, then the issue is reproducible