diff --git a/src/background/presenters/Notifier.ts b/src/background/presenters/Notifier.ts
index d586baf2..f7b035a2 100644
--- a/src/background/presenters/Notifier.ts
+++ b/src/background/presenters/Notifier.ts
@@ -1,12 +1,9 @@
 import { injectable } from "inversify";
 
 const NOTIFICATION_ID_UPDATE = "vimmatic-update";
-const NOTIFICATION_ID_INVALID_SETTINGS = "vimmatic-update-invalid-settings";
 
 export default interface Notifier {
   notifyUpdated(version: string, onclick: () => void): Promise<void>;
-
-  notifyInvalidSettings(error: Error, onclick: () => void): Promise<void>;
 }
 
 @injectable()
@@ -31,29 +28,4 @@ export class NotifierImpl implements NotifierImpl {
       message,
     });
   }
-
-  async notifyInvalidSettings(
-    error: Error,
-    onclick: () => void
-  ): Promise<void> {
-    const title = `Loading settings failed`;
-    // eslint-disable-next-line max-len
-    const message = `The default settings are used due to the last saved settings is invalid.  Check your current settings from the add-on preference: ${error.message}`;
-
-    const listener = (id: string) => {
-      if (id !== NOTIFICATION_ID_INVALID_SETTINGS) {
-        return;
-      }
-      onclick();
-      chrome.notifications.onClicked.removeListener(listener);
-    };
-    chrome.notifications.onClicked.addListener(listener);
-
-    chrome.notifications.create(NOTIFICATION_ID_INVALID_SETTINGS, {
-      type: "basic",
-      iconUrl: chrome.extension.getURL("resources/icon_48x48.png"),
-      title,
-      message,
-    });
-  }
 }
diff --git a/src/background/presenters/ToolbarPresenter.ts b/src/background/presenters/ToolbarPresenter.ts
index c8dcdd1b..debc4ff4 100644
--- a/src/background/presenters/ToolbarPresenter.ts
+++ b/src/background/presenters/ToolbarPresenter.ts
@@ -10,39 +10,13 @@ export default interface ToolbarPresenter {
 export class ToolbarPresenterImpl {
   async setEnabled(enabled: boolean): Promise<void> {
     const path = enabled
-      ? "resources/enabled_32x32.png"
-      : "resources/disabled_32x32.png";
+      ? "../resources/enabled_32x32.png"
+      : "../resources/disabled_32x32.png";
 
-    // chrome.action is supported on v3 api
-    if (
-      typeof chrome.action !== "undefined" &&
-      typeof chrome.action.setIcon === "function"
-    ) {
-      return chrome.action.setIcon({ path });
-    }
-
-    // firefox does not support chrome.action
-    if (
-      typeof chrome.browserAction !== "undefined" &&
-      typeof chrome.browserAction.setIcon === "function"
-    ) {
-      // v2 api on chromium requires callback on the 2nd argument
-      return new Promise((resolve) =>
-        chrome.browserAction.setIcon({ path }, resolve)
-      );
-    }
+    return chrome.action.setIcon({ path });
   }
 
   onClick(listener: (arg: chrome.tabs.Tab) => void): void {
-    // chrome.action is supported on v3 api
-    if (typeof chrome.action !== "undefined") {
-      chrome.action.onClicked.addListener(listener);
-      return;
-    }
-
-    // firefox does not support chrome.action
-    if (typeof chrome.browserAction !== "undefined") {
-      chrome.action.onClicked.addListener(listener);
-    }
+    chrome.action.onClicked.addListener(listener);
   }
 }