Examine source code of Link Player

{
  "manifest_version": 2,
  "name": "Link Player",
  "version": "1.0",
  "icons": {
    "48": "icons8-play-48.png"
  },
  "description": "Link Player forked and developed",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "inpage.js"
      ],
      "css": [
        "inpage.css"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "<all_urls>",
    "storage",
    "tabs",
    "webRequest"
  ],
  "browser_action": {
    "default_icon": "icons8-play-48.png",
    "default_title": "Link player",
    "default_popup": "popup.html",
    "browser_style": true
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "link-extractor-video-player@dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}