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							|  | (function() {
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							|  |   'use strict';
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							|  |   // Browser specific functions for Chrom*
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							|  |   window.extension = window.extension || {};
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							|  | 
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							|  |   extension.windows = {
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							|  |     onClosed: function(callback) {
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							|  |       window.addEventListener('beforeunload', callback);
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							|  |     },
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							|  |   };
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							|  | })();
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