Examine source code of 1000% Sound Booster

{
  "manifest_version": 3,
  "name": "1000% Sound Booster",
  "version": "1.0.2",
  "description": "Simple local-only tab audio booster with a 0-1000 slider. Look the one I used to got banned and the others on the store all requested weird permissions, so i vibecoded one without the ads and tracking",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "tabs",
    "webNavigation"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "1000% Sound Booster",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/booster.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "sound-booster@local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}