if I use our CaptainCasa application as applet in Firefox 23.0.1 and open a modal popup,
then I can't switch to other tabs in the same browser window.
If I start another instance of Firefox, then it doesn't respond until I close the popup in the first Firefox.
I have tested this with Firefox 23.0.1 on Windows 8 and on Windows XP.
Also with Internet Explorer there seems to be similar problems.
Firefox V 24.0 is partly fixed:
Now it is at least possible to start another browser instance (second firefox window).
But all other tabs in the first firefox window remain unreachable.
The opened dialog seems to be modal for the whole firefox window, not only for the current tab.