Examine source code of Waveform

{
  "manifest_version": 3,
  "name": "Waveform",
  "version": "1.2.1",
  "description": "Adjust audio volume and display other audio and video information.",
  "author": "Brayden Seaman",
  "browser_specific_settings": {
    "gecko": {
      "id": "waveform@brayden.dev",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "128.0"
    }
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    },
    "default_title": "Waveform"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "audio-injector.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}