Additional plugins are required to display all the media on this page - Firefox 10.0.2

Hi,

When I attempt to load my gwt application in firefox 10.0.2 with the
plugin installed I still get the screen telling me to install the
plugin. I also got message at the top of page saying "additional
plugins are required to display all media on this page" .The same gwt
application is loading properly in IE without need plugin install.

I need to solve this problem using gwt program. Do we have any
possible way to deal this issue with firefox. I do not need to press
install button in firefox browser for each browser to getting issue
solved.
I am new to plugin concept. Request you to suggest and guide me.

Thanks
Jee

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