Examine source code of L33's Audio Equalizer

{
  "manifest_version": 3,
  "name": "L33's Audio Equalizer",
  "version": "1.7",
  "description": "Simple audio equalizer with built in reverb slider.\nThe reverb slider is meant to simulate a car's interior.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "webaudiocapture@ethan.dev",
      "strict_min_version": "109.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts/inject.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "content_scripts/impulse.wav"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "48": "icons/icon-48.png"
    }
  },
  "options_ui": {
    "page": "config_page/index.html",
    "open_in_tab": true
  }
}