Syntax: the full URL to a proxy auto-config (PAC) script
This specifies the URL to a PAC script. The script is fetched once at the start of a walk, and then run for each URL walked, to determine the proxy (or direct fetch) to use for that URL. This setting overrides Proxy.
A proxy auto-config script can be used to dynamically configure the
proxy to use on a URL-by-URL basis, instead of using one proxy for all
URLs. The script can also return multiple proxies to use; e.g. a
primary, and fallback(s) to use if the primary is unreachable. See
findproxyforurl.com for more information on PAC
In Windows Control Panel, the Internet Options → Connections tab → LAN settings → Use automatic configuration script address value is equivalent to Webinator's Proxy Auto-Config URL setting.