diff --git a/devtools/shared/network-observer/NetworkObserver.sys.mjs b/devtools/shared/network-observer/NetworkObserver.sys.mjs
index 4fb9192bbb9a..8a740d893b56 100644
--- a/devtools/shared/network-observer/NetworkObserver.sys.mjs
+++ b/devtools/shared/network-observer/NetworkObserver.sys.mjs
@@ -86,11 +86,13 @@ const HTTP_DOWNLOAD_ACTIVITIES = [
  *        This function will be called for every detected channel to decide if it
  *        should be monitored or not.
  * @param {Function(NetworkEvent): owner} options.onNetworkEvent
- *        This method is invoked once for every new network request with a single
- *        "networkEvent" argument, which is an object created by
- *        NetworkUtils:createNetworkEvent, containing initial network request
- *        information as an argument.
- *        onNetworkEvent() must return an "owner" object which holds several add*()
+ *        This method is invoked once for every new network request with two
+ *        arguments:
+ *        - {Object} networkEvent: object created by NetworkUtils:createNetworkEvent,
+ *          containing initial network request information as an argument.
+ *        - {nsIChannel} channel: the channel for which the request was detected
+ *
+ *        `onNetworkEvent()` must return an "owner" object which holds several add*()
  *        methods which are used to add further network request/response information.
  */
 export class NetworkObserver {
@@ -722,7 +724,7 @@ export class NetworkObserver {
     httpActivity.isXHR = event.isXHR;
     httpActivity.private = event.private;
     httpActivity.fromServiceWorker = fromServiceWorker;
-    httpActivity.owner = this.#onNetworkEvent(event);
+    httpActivity.owner = this.#onNetworkEvent(event, channel);
 
     // Bug 1489217 - Avoid watching for response content for blocked or in-progress requests
     // as it can't be observed and would throw if we try.
diff --git a/devtools/shared/network-observer/test/browser/browser_networkobserver.js b/devtools/shared/network-observer/test/browser/browser_networkobserver.js
index 534166b6fc0d..73e9f8510aaa 100644
--- a/devtools/shared/network-observer/test/browser/browser_networkobserver.js
+++ b/devtools/shared/network-observer/test/browser/browser_networkobserver.js
@@ -46,3 +46,27 @@ add_task(async function testMultipleRequests() {
     "Received the expected number of network events"
   );
 });
+
+add_task(async function testOnNetworkEventArguments() {
+  await addTab(TEST_URL);
+
+  const onNetworkEvent = new Promise(resolve => {
+    const networkObserver = new NetworkObserver({
+      ignoreChannelFunction: () => false,
+      onNetworkEvent: (...args) => {
+        resolve(args);
+        return createNetworkEventOwner();
+      },
+    });
+    registerCleanupFunction(() => networkObserver.destroy());
+  });
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [REQUEST_URL], _url => {
+    content.wrappedJSObject.sendRequest(_url);
+  });
+
+  const args = await onNetworkEvent;
+  is(args.length, 2, "Received two arguments");
+  is(typeof args[0], "object", "First argument is an object");
+  ok(args[1] instanceof Ci.nsIChannel, "Second argument is a channel");
+});