http://k3oxb4lrs7l3vt2lhy3w5ilrrqzeltdxjyne3t7sctmnyu3ypwpuszid.onion/webtunnel.html
They are there only because the pluggable transport syntax requires them. When you start Tor Browser, click Configure Connection . Scroll down to where it says Enter bridge address you already know , and click Add new bridges... .