title: Customize alert title in chrome extension
body: <p>I have an Chrome extension, that displays messages using the alert() call. The default behaviour display the title as "The extension at  says: ...". Can't this be changed to something meaningful? I tried using the Rich Notification API but has limits on the size of the text that gets displayed in the box.</p>
  
  <p>I am able to this in firefox using:
  <a href="https://developer.mozilla.org/en-US/Add-ons/Overlay_Extensions/XUL_School/Adding_windows_and_dialogs#Alert" rel="nofollow">https://developer.mozilla.org/en-US/Add-ons/Overlay_Extensions/XUL_School/Adding_windows_and_dialogs#Alert</a></p>
  
  <p>But can't find something similar for Chrome.</p>