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firefox could not install the search plugin from "https://addons.mozilla.org/firefox/downloads/latest/4613/addon-4613-latest.xml?src=search" because an engine with the same name already exists.

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When I want to add the Weather Channel I get the following error message;

firefox could not install the search plugin from "https://addons.mozilla.org/firefox/downloads/latest/4613/addon-4613-latest.xml?src=search" because an engine with the same name already exists.. I have Firefox 3.617. Have uninstalled it removed everything and reinstalled it again, same problem. Have uninstalled it again. Installed Firefox 4. Same problen How can I add the Weather Channel? Thanks

When I want to add the Weather Channel I get the following error message; firefox could not install the search plugin from "https://addons.mozilla.org/firefox/downloads/latest/4613/addon-4613-latest.xml?src=search" because an engine with the same name already exists.. I have Firefox 3.617. Have uninstalled it removed everything and reinstalled it again, same problem. Have uninstalled it again. Installed Firefox 4. Same problen How can I add the Weather Channel? Thanks

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I use Zone Alarm I also did close Zonealarm and tried to install the Weather Channel, but the same problem