 class="self-link-parent"><a name="Extension.url">  </a><span style="color: grey">6</span><b>. Extension.url</b><a href="#Extension.url" title="link to here" class="self-link"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1792 1792" xmlns:xlink="http://www.w3.org/1999/xlink" width="16" class="self-link" height="16"><path d="M1520 1216q0-40-28-68l-208-208q-28-28-68-28-42 0-72 32 3 3 19 18.5t21.5 21.5 15 19 13 25.5 3.5 27.5q0 40-28 68t-68 28q-15 0-27.5-3.5t-25.5-13-19-15-21.5-21.5-18.5-19q-33 31-33 73 