ChessCom board centerer
Centers the board on chess.com, so it's not offset to the left, also available for youtube player @ https://addons.mozilla.org/en-US/firefox/addon/youtube-player-centerer/
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Centers the board on chess.com, so it's not offset to the left, also available for youtube player @ https://addons.mozilla.org/en-US/firefox/addon/youtube-player-centerer/