Firefox 4, Java and Mac OS X not working

I see lots of problems with JAVA not working after installing in Mac OS X. I too, cannot get Firefox 4 to work Java on any sites. It says the plugin is missing, but then cannot install it. I've tried 32 bit mode, changing Java pref's to handle things itself, but to no avail.
I am trying to open Command Center 2.0 in TD Ameritrade like I have been doing before Firefox 4.
Help!!!

You have to get the latest Java through Software Update (under the apple), and then re-install the binaries for the Java Embedded Plugin which you can find @ http://sourceforge.net/projects/javaplugin/
(read the README file for how to install)
Also go to "about:config" and set 'dom.ipc.plugins.java.enabled' to TRUE.
Not sure why all this needs to be done or why java plugin is disabled by default. Looks like something was overlooked in this last release.

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