Examine source code of Burger Identity Manager

{
  "manifest_version": 2,
  "name": "Burger Identity Manager",
  "short_name": "Burger",
  "version": "0.2.1",
  "description": "Manage and use Burger identities in your browser",
  "author": "Jeff Martin",
  "homepage_url": "https://codeberg.org/cuchazinteractive/burger",
  "icons": {
    "48": "images/burger.svg",
    "96": "images/burger.svg"
  },
  "background": {
    "scripts": [
      "shared.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Burger",
    "default_area": "menupanel"
  },
  "page_action": {
    "default_title": "Burger",
    "default_popup": "popup",
    "default_icon": "images/burger.svg"
  },
  "permissions": [
    "storage"
  ],
  "protocol_handlers": [
    {
      "protocol": "ext+burger",
      "name": "Burger",
      "uriTemplate": "/link#%s"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "burger@cuchaz"
    }
  }
}