Examine source code of togglavatar

{
  "name": "togglavatar",
  "version": "1.2.2",
  "description": "Use microphone volume to toggle an avatar in your browser.",
  "homepage_url": "https://github.com/hchiam/togglavatar",
  "permissions": [
    "storage",
    "unlimitedStorage"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "shared.js",
        "page.js"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "{786c1dc1-8886-e16c-aa4d-462506a44db3}"
    }
  }
}