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.
Type the word: proxy
In the search box labeled: Find in Options
You should see the result named: Network Proxy
Tap the Settings… button
In the field named Automatic proxy configuration URL: copy the following 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.
Open our detection page and check if DNSProxy is active on your computer.