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function determineActiveURL(callback) {
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    var b = window.URL || window.webkitURL,
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        tabURL, parsedURL;
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    chrome.tabs.query({
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        active: true,
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        windowId: chrome.windows.WINDOW_ID_CURRENT
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    }, function(tabs) {
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      if (!tabs || tabs.length == 0 || !tabs[0].url) {
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        return;
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      }
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      tabURL = tabs[0].url;
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      parsedURL = new window.URL(tabURL);
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      if (parsedURL.hostname) {
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        callback(parsedURL);
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      }
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    })
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}