1 files changed, 5 insertions, 5 deletions

diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index 45db9660..d9f9b586 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -60,7 +60,7 @@ class Backend {
         this.applyOptions();
 
         const callback = () => this.checkLastError(chrome.runtime.lastError);
-        chrome.tabs.query({}, tabs => {
+        chrome.tabs.query({}, (tabs) => {
             for (const tab of tabs) {
                 chrome.tabs.sendMessage(tab.id, {action: 'optionsUpdate', params: {source}}, callback);
             }
@@ -73,12 +73,12 @@ class Backend {
 
     onMessage({action, params}, sender, callback) {
         const handlers = Backend.messageHandlers;
-        if (handlers.hasOwnProperty(action)) {
+        if (hasOwn(handlers, action)) {
             const handler = handlers[action];
             const promise = handler(params, sender);
             promise.then(
-                result => callback({result}),
-                error => callback({error: errorToJson(error)})
+                (result) => callback({result}),
+                (error) => callback({error: errorToJson(error)})
             );
         }
 
@@ -177,7 +177,7 @@ class Backend {
         }
     }
 
-    checkLastError(e) {
+    checkLastError() {
         // NOP
     }
 }