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diff --git a/toolkit/components/captivedetect/test/captive-portal-simulator.js b/toolkit/components/captivedetect/test/captive-portal-simulator.js
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+/*
+ * This is a NodeJS script that crudely simulates a captive portal.  It is
+ * intended for use by QA and engineering while working on the captive portal
+ * feature in Firefox.
+ *
+ * It maintains the authentication state (logged in or logged out). The root
+ * URL ("/") displays either a link to log out (if the state is logged in) or
+ * to log in (if the state is logged out).  A canonical URL ("/test") is
+ * provided: when this URL is requested, if the state is logged in, a "success"
+ * response is sent. If the state is logged out, a redirect is sent (back to
+ * "/"). This script can be used to test Firefox's captive portal detection
+ * features by setting the captivedetect.canonicalURL pref in about:config to
+ * http://localhost:8080/test.
+ *
+ * Originally written by Nihanth.
+ *
+ * Run it like this:
+ *
+ *  mach node toolkit/components/captivedetect/test/captive-portal-simulator.js
+ */
+
+// eslint-disable-next-line no-undef
+var http = require("http");
+
+const PORT = 8080;
+
+// Crude HTML for login and logout links
+// loggedOutLink is displayed when the state is logged out, and shows a link
+// that sets the state to logged in.
+const loggedOutLink = "<html><body><a href='/set'>login</a></body></html>";
+// loggedInLink is displayed when the state is logged in, and shows a link
+// that resets the state to logged out.
+const loggedInLink = "<html><body><a href='/reset'>logout</a></body></html>";
+
+// Our state constants
+const OUT = 0;
+const IN = 1;
+
+// State variable
+var state = OUT;
+
+function handleRequest(request, response) {
+  if (request.url == "/reset") {
+    // Set state to logged out and redirect to "/"
+    state = OUT;
+    response.writeHead(302, { location: "/" });
+    response.end();
+  } else if (request.url == "/set") {
+    // Set state to logged in and redirect to canonical URL
+    state = IN;
+    response.writeHead(302, { location: "/test" });
+    response.end();
+  } else if (request.url == "/test") {
+    // Canonical URL. Send canonical response if logged in, else
+    // redirect to index.
+    if (state == IN) {
+      response.setHeader("Content-Type", "text/html");
+      response.end(
+        `<meta http-equiv="refresh" content="0;url=https://support.mozilla.org/kb/captive-portal"/>`
+      );
+      return;
+    }
+    response.writeHead(302, { location: "/" });
+    response.end();
+  } else {
+    // Index: send a login or logout link based on state.
+    response.setHeader("Content-Type", "text/html");
+    response.end(state == IN ? loggedInLink : loggedOutLink);
+  }
+}
+
+// Start the server.
+var server = http.createServer(handleRequest);
+server.listen(PORT, function () {
+  console.log("Server listening on: http://localhost:%s", PORT);
+});