Examine source code of Volume Booster 300

{
  "manifest_version": 3,
  "name": "Volume Booster 300",
  "version": "1.0.12",
  "description": "Enhances and fine-tunes audio in the active tab, with boost support up to 300% and a convenient popout control window.",
  "browser_specific_settings": {
    "gecko": {
      "id": "volume-booster-300@outofthejack",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icon.png",
    "32": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage",
    "tabs"
  ],
  "incognito": "not_allowed",
  "action": {
    "default_title": "Volume Booster 300",
    "default_icon": {
      "16": "icon.png",
      "32": "icon.png"
    },
    "default_popup": "popup.html"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}