title: How to get the id of a Chrome tab?
body: <p><code>chrome.tabs.get</code> apparently doesn't work in the content script, and other than sending it through <code>chrome.extension.sendRequest</code> I've no idea how to make the background respond to the correct tab.</p>
  
  <p>How can I make the content script send information to the background page, then the background page return information back to the tab where it came from?</p>