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Getting this message when trying to install weather addon: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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Getting this message when trying to install weather addon: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.

Getting this message when trying to install weather addon: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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That means you already have a search engine in the search box named "weather.com" and Firefox refuses to install it twice. Apart from that, does the addon work fine?