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Works fine with Firefox 30+, but you need to drag the 365 scores add-on onto to the add-on bar, that is on the top [NO LONGER ON THE BOTTOM] (next to the home page bar and downloads bar).
1.install it
2.click on menu > customize > drag the 365 scores add-on from additional tools and features into the top bar (I personally put it there instead of google search bar, cause there's not that much space, but it's your choice)
3. restart firefox
4. customize it however you like :)