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When I clicked on Add to Firefox plugin from https://addons.mozilla.org ,
It is not showing on addons manager. I have search on extension as well as on apperance But when I click again on that same button 'Add to Firefox` it is showing error:

    Firefox could not install the search plugin from '................. ' 
because an engine with the same name already exists.

So that add-on exists in my browser. How do I remove it? I am using firefox 28.0

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