GWT Developer Plugin not working in Namoroka (Firefox) Linux x86_64

I can't get the GWT Developer Plugin working in Namoroka Mozilla/5.0
(X11; U; Linux x86_64; en-US; rv:1.9.2.8) Gecko/20100724 Firefox/3.6.8

I install successfully the plugin, or at least I see it in my list of
add-ons, but the browser keeps me again to install it again and again.

Somebody got the plugin work in Namoroka?

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