Examine source code of Save image as Type

{
  "manifest_version": 3,
  "name": "__MSG_extName__",
  "short_name": "__MSG_extShortName__",
  "description": "__MSG_extDescription__",
  "version": "2.0.1",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "SaveImageAsType@d7om.dev",
      "strict_min_version": "110.0"
    }
  },
  "icons": {
    "16": "assets/icons/icon-16.svg",
    "48": "assets/icons/icon-48.svg",
    "128": "assets/icons/icon-128.svg"
  },
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "options_ui": {
    "page": "src/options/options.html",
    "open_in_tab": false
  },
  "permissions": [
    "downloads",
    "contextMenus",
    "activeTab",
    "scripting",
    "storage",
    "offscreen"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "homepage_url": "https://github.com/d7omdev/Save-Image-as-Type"
}