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I can't get the Firefox supported bing add-on to download

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When I went to download the Firefox Supported add-on and pressed "Accept and Install" it said: Firefox could not install the search plugin from "https://addons.mozilla.org/firefox/downloads/file/54407/bing-20090601.xml?src=addondetail" because an engine with the same name already exists.

When I went to download the Firefox Supported add-on and pressed "Accept and Install" it said: Firefox could not install the search plugin from "https://addons.mozilla.org/firefox/downloads/file/54407/bing-20090601.xml?src=addondetail" because an engine with the same name already exists.

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That means you already have a Bing Search engine in the Search Bar.

https://support.mozilla.com/en-US/kb/Search%20bar