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    <p><code>chrome.tabs.getSelected</code> is <strong>asynchronous</strong>. That means that when the callback function is called, <code>return url</code> "has already occurred".</p> <p>You've got two options to achieve the desired effect.</p> <ol> <li><p>Properly rewrite your code, to correctly implement the asynchronous aspect (the exact details depends on your extension's implementation).<br> Note that <code>getSelected</code> has been <a href="http://code.google.com/chrome/extensions/whats_new.html#16" rel="noreferrer">deprecated</a> and replaced with <a href="http://code.google.com/chrome/extensions/tabs.html#method-query" rel="noreferrer"><code>chrome.tabs.query</code></a> since Chrome 16.</p></li> <li><p>Maintain a hash with the current URLs using <a href="http://code.google.com/chrome/extensions/tabs.html#event-onUpdated" rel="noreferrer"><code>chrome.tabs.onUpdated</code></a> (add tabID + URL), <a href="http://code.google.com/chrome/extensions/tabs.html#event-onRemoved" rel="noreferrer"><code>chrome.tabs.onRemoved</code></a> (to remove obsolete entries) and <a href="http://code.google.com/chrome/extensions/tabs.html#event-onActivated" rel="noreferrer"><code>chrome.tabs.onActivated</code></a> (to set the current active tab).</p></li> </ol> <p>Code for 2:</p> <pre class="lang-js prettyprint-override"><code>// Our hash var tabIdToURL = {}; var currentTabId = -1; // Add changes to the hash (tab creation, tab's page load) chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) { tabIdToURL[tabId] = tab.url; // also available as tab.id and changeInfo.url }); // Remove entries from closed tabs chrome.tabs.onRemoved.addListener(function(tabId) { delete tabIdToURL[tabId]; }); // Set the ID of the current active tab chrome.tabs.onActivated.addListener(function(activeInfo) { currentTabId = activeInfo.tabId; }); // Usage, based on the question's function function getURL() { return tabIdToURL[currentTabId] || ''; } </code></pre>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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