Examine source code of Manga Reading

{
  "manifest_version": 2,
  "name": "Manga Reading List",
  "version": "1.0",
  "description": "Manually track your manga reading list and keep your favorite titles in one place.",
  "background": {
    "scripts": [
      "popup.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e8f94dd0-f8f6-47bf-b97e-30f3131d041f}"
    }
  }
}