Examine source code of InstaNeverPause

{
  "manifest_version": 3,
  "name": "InstaNeverPause",
  "short_name": "INP",
  "version": "1.2",
  "author": "LaneZeroX@proton.me",
  "description": "Keep active Instagram videos playing when switching tabs or minimizing Firefox.",
  "homepage_url": "https://github.com/LaneZero/InstaNeverPause",
  "permissions": [
    "storage"
  ],
  "action": {
    "default_area": "navbar",
    "default_popup": "popup.html",
    "default_title": "InstaNeverPause - Keep Videos Playing",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png",
    "512": "icons/icon512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.instagram.com/*"
      ],
      "js": [
        "page-guard.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "matches": [
        "https://*.instagram.com/*"
      ],
      "js": [
        "storage.js",
        "content.js"
      ],
      "run_at": "document_start",
      "world": "ISOLATED"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{16964ca2-5e51-4728-80bf-5f05a10e2643}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}