Examine source code of Audio Console / Mixer

{
  "name": "Audio Console",
  "icons": {
    "48": "icons/icon.svg"
  },
  "manifest_version": 2,
  "description": "Professional per-tab audio mixing console for Firefox",
  "browser_specific_settings": {
    "gecko": {
      "id": "audio-console@samanthahldr",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "tabs",
    "tabGroups",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "sidebar_action": {
    "default_title": "Audio Console",
    "default_panel": "sidebar/sidebar.html",
    "default_icon": {
      "48": "icons/icon.svg"
    }
  },
  "web_accessible_resources": [
    "worklets/*.js"
  ],
  "version": "2.1.0"
}