Examine source code of Open Instagram Profile

{
  "manifest_version": 2,
  "name": "Open Instagram Profile",
  "version": "1.0",
  "description": "Allows you to quickly open an Instagram profile by selecting a username and using a context menu option",
  "icons": {
    "48": "icon.png"
  },
  "background": {
    "scripts": [
      "index.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "menus",
    "tabs",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{21185438-4664-4c2e-aa12-7c70b626df15}"
    }
  }
}