FULL PRODUCT VERSION :
java version "1.6.0_25"
Java(TM) SE Runtime Environment (build 1.6.0_25-b06)
Java HotSpot(TM) Server VM (build 20.0-b11, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Fedora Linux 14

Linux localhost.localdomain 2.6.35.12-88.fc14.i686 #1 SMP Thu Mar 31 22:12:38 UTC 2011 i686 i686 i386 GNU/Linux

EXTRA RELEVANT SYSTEM CONFIGURATION :
FireFox 3.6 / 4.0

A DESCRIPTION OF THE PROBLEM :
When loading Applets, Plugin2 completly locks the browser on Linux (on Windows, the browser is still responsive while loading applets).

I've developed a huge Applet (all in all 15mb jar files), which takes minutes to load over slow connection the first time. During all this time FireFox is completly unresponsive and blocked (doesn't even repaint itself).
The slow loading isn't a huge problem, the few users using the Applet remotly are informed about this issue. However because the browser is blocked, often they kill the browser because they think its hung.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Load a huge Applet with FireFox+Linux

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
While the applet is loading, the browser should stay responsive.
The user should be able to user the browser for browsing during the Plugin is downloading the applet.
ACTUAL -
The browser is completly blocked.

REPRODUCIBILITY :
This bug can be reproduced always.