Firefox Proxy URL Configuration

Click on the icon Open menu in the top-right corner of Firefox.
Then click Options to open the configuration page.
Select the Advanced from the lef-side list.
Then select the Network tab.
Then click Settings... in order to open the next window.
In the field named Automatic proxy configuration URL: copy the following URL:

Please login to see the proxy URL.

Hint: Please enter the proxy URL correctly with no missing /extra characters. The proxy will work only if the Proxy URL is correct.
Click OK to finish the configuration.