To remove the TellyPass proxy URL from Firefox, please follow the steps below:

1. In Firefox menu click on Options.
2. Select the Advanced icon in the advanced configuration window.
3. Then select the Network tab.
4. Then push the Settings button in order to open the Connection Settings window.
5. Select the first option: No proxy
   At the top of the page
6. Click OK twice in order to save the settings and close the configuration windows.

You can open our channels page and check that your Mac is no longer configured.
http://www.tellypass.com/channels.html

If the TellyPass DNS is still active you will have to remove also the DNS settings from your PC.
http://www.tellypass.com/remove-mac-dns.html