diff --git a/src/background.js b/src/background.js
index 6d427a9..960c257 100644
--- a/src/background.js
+++ b/src/background.js
@@ -52,7 +52,7 @@ async function fetchNewData() {
 					type: 'basic',
 					title: browser.i18n.getMessage('stateNotificationTitle'),
 					message: browser.i18n.getMessage('stateNotificationMessage', state),
-					iconUrl: browser.runtime.getURL('icons/favicon.svg')
+					iconUrl: browser.runtime.getURL('icons/favicon.svg'),
 				});
 			}
 		}
@@ -66,6 +66,10 @@ async function fetchNewData() {
 	}
 }
 
+browser.runtime.onStartup.addListener(async () => {
+	await browser.storage.local.remove(['calendar', 'spaceApi']);
+});
+
 /**
  * @param {Alarm} alarm
  */