We are using JavaFX1.3 and hosting it's content on web page like in that tutorial (http://goo.gl/yzbNx).
And after some new version of firefox (or may be javaplugin), the connection between applet (javafx) and javascript has been broken.

For example code from tutorial (http://goo.gl/yzbNx):

What should be:
var app = document.getElementById("myApplet");
app.script.color = app.Packages.javafx.scene.paint.Color.BLUE;
// app.script must be defined

What I have:
var app = document.getElementById("myApplet");
app.script.color = app.Packages.javafx.scene.paint.Color.BLUE;
// app.script is undefined and i have an error

It can be appeared under Ubuntu 10.10 and Firefox 3.6.16, 3.6.17.
With Google Chrome all is OK, with Firefox in Windows all is OK.