Examine source code of Ghost Story

{
  "manifest_version": 2,
  "name": "Ghost Story",
  "author": "E.Dev",
  "version": "1.5",
  "description": "Watch someone’s Instagram Story without them knowing!",
  "homepage_url": "https://www.faranevis.com",
  "icons": {
    "48": "icons/ghost.png"
  },
  "permissions": [
    "webRequest",
    "contextMenus",
    "activeTab",
    "tabs",
    "*://www.instagram.com/*"
  ],
  "page_action": {
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.instagram.com/"
      ],
      "js": [
        "ghost_story.js"
      ]
    }
  ]
}