Examine source code of Cookie Manager

{
  "manifest_version": 2,
  "name": "Cookie Manager",
  "version": "1.2.4resigned1",
  "description": "__MSG_manifest_description__",
  "author": "Olivier Meunier",
  "applications": {
    "gecko": {
      "id": "identity-ext@neokraft.net",
      "strict_min_version": "56.0"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "<all_urls>",
    "contextualIdentities",
    "cookies",
    "privacy",
    "tabs"
  ],
  "default_locale": "en",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "32": "icons/icon-action.png"
    },
    "theme_icons": [
      {
        "light": "icons/icon-action-dark.png",
        "dark": "icons/icon-action.png",
        "size": 32
      }
    ]
  }
}