Examine source code of Download Router

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.2.2",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "permissions": [
    "contextMenus",
    "downloads",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.svg"
    },
    "default_popup": "popup/popup.html",
    "default_title": "__MSG_extensionName__"
  },
  "icons": {
    "48": "icons/icon-48.svg",
    "96": "icons/icon-96.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "download-router@joanl",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "technical_data": [
          "none"
        ],
        "interaction_data": [
          "none"
        ]
      }
    }
  }
}