diff --git a/src/background.js b/src/background.js
index 07e93d9..929f582 100644
--- a/src/background.js
+++ b/src/background.js
@@ -374,12 +374,12 @@ function removeListeners() {
   chrome.webRequest.onHeadersReceived.removeListener(onHeadersReceivedCookie);
   chrome.webRequest.onBeforeSendHeaders.removeListener(onBeforeSendHeadersCookie);
   for (let item of callbacksOnBeforeRequestCookie) {
-    if (callbacksOnBeforeRequestCookie.hasOwnProperty(item)) {
+    if (Object.prototype.hasOwnProperty.call(callbacksOnBeforeRequestCookie, item)) {
       chrome.webRequest.onBeforeRequest.removeListener(item);
     }
   }
   for (let item of callbacksOnBeforeSendHeadersInjection) {
-    if (callbacksOnBeforeSendHeadersInjection.hasOwnProperty(item)) {
+    if (Object.prototype.hasOwnProperty.call(callbacksOnBeforeSendHeadersInjection, item)) {
       chrome.webRequest.onBeforeSendHeaders.removeListener(item);
     }
   }