Examine source code of InstaNeverPause

{
  "manifest_version": 2,
  "name": "InstaNeverPause",
  "version": "1.0.1",
  "description": "Keep Instagram videos playing when switching tabs - Never pause again!",
  "permissions": [
    "activeTab",
    "storage",
    "https://www.instagram.com/*",
    "https://instagram.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.instagram.com/*",
        "*://instagram.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "InstaNeverPause",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{16964ca2-5e51-4728-80bf-5f05a10e2643}"
    }
  }
}