Examine source code of Soundmark for SoundCloud

{
  "manifest_version": 2,
  "version": "1.5.0",
  "name": "Soundmark for SoundCloud",
  "description": "Create and manage SoundCloud timestamps.",
  "browser_specific_settings": {
    "gecko": {
      "id": "soundmark@edubio.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "*://*.soundcloud.com/*",
    "tabs",
    "storage",
    "unlimitedStorage",
    "downloads",
    "scripting"
  ],
  "options_page": "options.html",
  "icons": {
    "16": "assets/icon_16.png",
    "48": "assets/icon_48.png",
    "128": "assets/icon_128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "assets/icon_48.png"
  },
  "background": {
    "page": "background.html"
  }
}