Examine source code of Cookie Viewer

{
  "manifest_version": 2,
  "name": "Cookie Viewer",
  "version": "1.0",
  "description": "View all cookies for the current site in popup",
  "permissions": [
    "cookies",
    "tabs",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1b4ef320-6994-45ab-8436-7389d0590cca}",
      "strict_min_version": "115.0"
    }
  },
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": {
      "64": "icon64.png",
      "128": "icon128.png"
    },
    "default_title": "Cookie Viewer",
    "default_popup": "popup.html"
  }
}