Examine source code of Torch PitchFinder

{
  "manifest_version": 3,
  "name": "Torch PitchFinder",
  "description": "Instantly detect the musical key and pitch of any audio playing in your browser tabs for musicians and DJs.",
  "version": "1.0.0",
  "author": "SoundWave Labs",
  "permissions": [
    "activeTab",
    "audioCapture",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "torchpitchfinder@soundwavelabs.addons.mozilla.org",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}