Examine source code of OutlineCraft

{
  "manifest_version": 2,
  "name": "OutlineCraft",
  "version": "1.0",
  "description": "Generate a webpage outline instantly! Scan headers to create a tree-like structure in a sleek pop-up",
  "permissions": [
    "activeTab",
    "downloads"
  ],
  "browser_action": {
    "default_popup": "outline_view.html",
    "default_icon": "craft_icon.png"
  },
  "icons": {
    "48": "craft_icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{097f7d9c-bf91-4619-a742-7014db1bfefd}"
    }
  }
}