firefox 4.0 compatible dictionary [closed]

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I have written a marathi dictionary that can be found here...

https://addons.mozilla.org/en-US/firefox/addon/marathi-dictionary/

The code is exactly same as any dictionary that can be found here...

https://addons.mozilla.org/en-US/firefox/language-tools/

My Dictionary does not work on 4.0 version while all other dictionary extension mentioned on that page does work with the latest version. My add-on works with all other earlier version without any problem. On 4.0开发者_如何学JAVA it installs but does not show up on right click.

Very confused what is going wrong.

Update:

It seems to use em:unpack. Could that be the reason.