4 files changed, 7 insertions, 7 deletions
diff --git a/devtools/shared/network-observer/test/browser/browser_networkobserver_auth_listener.js b/devtools/shared/network-observer/test/browser/browser_networkobserver_auth_listener.js
index e3492c10ad..2071029350 100644
--- a/devtools/shared/network-observer/test/browser/browser_networkobserver_auth_listener.js
+++ b/devtools/shared/network-observer/test/browser/browser_networkobserver_auth_listener.js
@@ -71,7 +71,7 @@ add_task(async function testAuthRequestWithoutListener() {
   const events = [];
   const networkObserver = new NetworkObserver({
     ignoreChannelFunction: channel => channel.URI.spec !== AUTH_URL,
-    onNetworkEvent: event => {
+    onNetworkEvent: () => {
       const owner = new AuthForwardingOwner();
       events.push(owner);
       return owner;
@@ -115,7 +115,7 @@ add_task(async function testAuthRequestWithForwardingListener() {
   const events = [];
   const networkObserver = new NetworkObserver({
     ignoreChannelFunction: channel => channel.URI.spec !== AUTH_URL,
-    onNetworkEvent: event => {
+    onNetworkEvent: () => {
       info("waitForNetworkEvents received a new event");
       const owner = new AuthForwardingOwner();
       events.push(owner);
@@ -167,7 +167,7 @@ add_task(async function testAuthRequestWithCancellingListener() {
   const events = [];
   const networkObserver = new NetworkObserver({
     ignoreChannelFunction: channel => channel.URI.spec !== AUTH_URL,
-    onNetworkEvent: event => {
+    onNetworkEvent: () => {
       const owner = new AuthCancellingOwner();
       events.push(owner);
       return owner;
diff --git a/devtools/shared/network-observer/test/browser/doc_network-observer-missing-service-worker.html b/devtools/shared/network-observer/test/browser/doc_network-observer-missing-service-worker.html
index 396e51677c..791190a1b3 100644
--- a/devtools/shared/network-observer/test/browser/doc_network-observer-missing-service-worker.html
+++ b/devtools/shared/network-observer/test/browser/doc_network-observer-missing-service-worker.html
@@ -21,9 +21,9 @@
         // NOTE: This service worker file does not exist which enables testing
         // that a 404 requests is received.
         return sw.register("serviceworker-missing.js")
-          .then(registration => {
+          .then(() => {
             throw new Error("The Service Worker file should not exist");
-          }).catch(err => {
+          }).catch(() => {
             console.log("Registration failed as expected");
           });
       }
diff --git a/devtools/shared/network-observer/test/browser/doc_network-observer.html b/devtools/shared/network-observer/test/browser/doc_network-observer.html
index 2ca400e0ae..78d751dfac 100644
--- a/devtools/shared/network-observer/test/browser/doc_network-observer.html
+++ b/devtools/shared/network-observer/test/browser/doc_network-observer.html
@@ -36,7 +36,7 @@
                   }, { once: true });
                 }
               });
-            }).catch(err => {
+            }).catch(() => {
               console.error("Registration failed");
             });
         }
diff --git a/devtools/shared/network-observer/test/browser/head.js b/devtools/shared/network-observer/test/browser/head.js
index deb7becff6..0c26e248aa 100644
--- a/devtools/shared/network-observer/test/browser/head.js
+++ b/devtools/shared/network-observer/test/browser/head.js
@@ -84,7 +84,7 @@ class NetworkEventOwner {
  * Create a simple network event owner, with mock implementations of all
  * the expected APIs for a NetworkEventOwner.
  */
-function createNetworkEventOwner(event) {
+function createNetworkEventOwner() {
   return new NetworkEventOwner();
 }