diff --git a/api-samples/web-accessible-resources/background.js b/api-samples/web-accessible-resources/background.js
index ba04bec9..8bcef815 100644
--- a/api-samples/web-accessible-resources/background.js
+++ b/api-samples/web-accessible-resources/background.js
@@ -1,14 +1,14 @@
-chrome.runtime.onInstalled.addListener(({ reason, version }) => {
+chrome.runtime.onInstalled.addListener(({ reason }) => {
   if (reason === chrome.runtime.OnInstalledReason.INSTALL) {
     showReadme();
   }
 });
 
-chrome.action.onClicked.addListener((tab) => {
+chrome.action.onClicked.addListener(() => {
   showReadme();
 });
 
-function showReadme(info, tab) {
+function showReadme() {
   const url = chrome.runtime.getURL('readme.html');
   chrome.tabs.create({ url });
 }