Settings as clean architecture

src/background/infrastructures/content-message-client.js

@@ -0,0 +1,12 @@
+import messages from '../../shared/messages';
+
+export default class ContentMessageClient {
+  async broadcastSettingsChanged() {
+    let tabs = await browser.tabs.query({});
+    for (let tab of tabs) {
+      browser.tabs.sendMessage(tab.id, {
+        type: messages.SETTINGS_CHANGED,
+      });
+    }
+  }
+}