Can't get the app to preview in Firefox 24.

I am stuck at this part here:

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Development Mode requires the GWT Developer Plugin

By downloading, you agree to the Terms of Service and Privacy Policy.

Download the GWT Developer Plugin
For Firefox

plugins for other systems

For help or troubleshooting, ask questions in the discussion group.
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I have already installed the plugin for firefox 24, which I am already running, but still I am not getting the app to work.  This is how I installed Firefox 24:

me@pc:~/Downloads$ sudo mv firefox24 /opt
me@pc:~/Downloads$ sudo ln -s /opt/firefox24/firefox /usr/bin/firefox24
me@pc:~/Downloads$ sudo firefox24

I restart firefox and go back to the address of the app and still the browser says to install the plugin, over and over.(The plugin appears in the Add-ons Manager)

I am pretty new to GWT, and was pretty impressed by its capabilities. What could I do to fix this issue? Thanks



Edward

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