The majority of the <code>chrome.tabs</code> API can be used without declaring
 any permission.
 However, the
 <code>"tabs"</code> permission is required in order to populate the
 <code><a href="#property-Tab-url">url</a></code>,
 <code><a href="#property-Tab-title">title</a></code>, and
 <code><a href="#property-Tab-favIconUrl">favIconUrl</a></code> properties of
 <code><a href="#type-Tab">Tab</a></code>.