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Unable to installl Linkedin Addon

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Firefox could not install the search plugin from "https://addons.mozilla.org/firefox/downloads/latest/4606/addon-4606-latest.xml?src=search" because an engine with the same name already exists.

I have no idea what this means, nor what I am supposed to do with it. What is an "engine"?

Firefox could not install the search plugin from "https://addons.mozilla.org/firefox/downloads/latest/4606/addon-4606-latest.xml?src=search" because an engine with the same name already exists. I have no idea what this means, nor what I am supposed to do with it. What is an "engine"?

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this is referring to a search engine in the firefox search bar on the top right of the window - apparently you already have linked-in installed there!

fore more information see Search bar - add, change and manage search engines on Firefox