Firefox Plugin for GWT not downloading

Today, i installed windows again on my laptop, as usual for the
firsttime when firefox starts a gwt host page, it asks to download the
plugin, but when i download the plugin, it says,

Google
Error

Not Found
The requested URL /gwt/plugins/firefox/gwt-dev-plugin.xpi was not
found on this server.

Can someone help, i need to fix this asap

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