Examine source code of Cutter — skip the silence

{
  "manifest_version": 2,
  "name": "Cutter — skip the silence",
  "description": "Fast-forwards silent and low-volume parts of any video. Basic skip runs locally; smart trim on YouTube is an opt-in Pro feature.",
  "version": "1.0.0",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "homepage_url": "https://cutter.nektonsoft.ru",
  "permissions": [
    "storage",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "cutter@cutter.app",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "personallyIdentifyingInfo"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Cutter",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/content.js"
      ]
    },
    {
      "matches": [
        "http://127.0.0.1:5173/*",
        "http://localhost:5173/*",
        "https://cutter.nektonsoft.ru/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/cutter-site.js"
      ]
    }
  ]
}