Fire-picker Optimization

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Currently fire-picker is injecting everything all at once into the tab the user is on when opened. This solution is a good way to do this operation but our current implementation of it is slow and has a few seconds of freeze on the page.

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One way this could be fixed is the use of the Windows API from Firefox based on mouse location which would let us work with loading the emoji picker all together rather than injecting one by one making the website lag and causing other problems like CSS collision on websites.

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Solves #2 not having to deal with onsite injection.