Differences

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--- howto:firefox-proxy [2025/08/13 22:46] – created Wulf Rajek
+++ howto:firefox-proxy [2025/08/14 15:16] (current) – Wulf Rajek
@@ Line 1: / Line 1: @@
-====== Firefox Proxy ======
+====== Firefox/Chrome Proxy ======
-To use a proxy for specific sites only, the easiest option is to create a pac file and configure Firefox to use it as automatic proxy configuration.
+To use a proxy for specific sites only, the easiest option is to create a pac file and configure Firefox/Chrome to use it as automatic proxy configuration.
 Example pac file:
@@ Line 9: / Line 9: @@
         return "HTTP 192.168.0.1:8888";
     }
+}
+</code>
+Possible option to identify network to only use proxy if in home network or private ip range:
+<code>
+function FindProxyForURL(url, host) {
+    var myIP = myIpAddress();
+    // Detect by IP range (example: 192.168.1.x) or DNS suffix (example: home.lan)
+    if (
+        isInNet(myIP, "192.168.1.0", "255.255.255.0") ||
+        dnsDomainIs(host, ".home.lan")
+    ) {
+        return "PROXY proxy.example.com:8080";
+    }
+    // Otherwise, no proxy
+    return "DIRECT";
 }
 </code>
@@ Line 14: / Line 32: @@
 Store this somewhere and go to about:preferences -> general -> Network settings (very bottom) -> settings, select "Automatic proxy configuration URL" and enter the path to the pac file in the file protocol notation, e.g.:
 <code>
-file:///home/user/.mozilla/firefox/ffox.default/custom_proxies.pac
+file:///home/user/.config/custom_proxies.pac
 </code>
 After making changes to the file, go back to the Firefox proxy configuration URL settings and click reload.
+Further info:
+[[https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Proxy_servers_and_tunneling/Proxy_Auto-Configuration_PAC_file|Mozilla Dev]]
+Chrome/Chromium:
+These browsers use the system proxy settings and do not have a GUI option to set custom proxies. Proxies and bypass urls need to be set via command line:
+<code>
+--proxy-server="foopy:8080" --proxy-bypass-list="*.google.com;*foo.com;127.0.0.1:8080"
+--proxy-pac-url="http://wpad/windows.pac"
+</code>