Examine source code of Simple Audio Compressor

{
  "manifest_version": 2,
  "name": "Audio Compressor",
  "version": "1.0",
  "description": "Compresses audio in the browser to make lows louder and highs quieter.",
  "permissions": [
    "activeTab",
    "storage",
    "management",
    "tabs",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "48": "icons/compressor-48.png"
    }
  },
  "options_ui": {
    "page": "options/page.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@simple-compressor",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icons/compressor-48.png"
  }
}