Examine source code of Remember-Tabs

{
  "manifest_version": 3,
  "name": "Tab Sticky Notes 📝",
  "version": "1.1",
  "description": "Add sticky notes to your tabs to remember why you opened them and stay organized!",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Tab Sticky Notes"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-sticky-notes@example.com"
    }
  }
}