Examine source code of Draft Coach

{
  "manifest_version": 2,
  "name": "Draft Coach",
  "version": "1.0",
  "description": "A sidebar tool to help you improve your writing drafts.",
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "sidebar_action": {
    "default_title": "Draft Coach",
    "default_icon": {
      "48": "icon.png"
    },
    "default_panel": "sidebar.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ca289231-609e-4b72-a7bd-3e25ed4b2467}"
    }
  }
}