Examine source code of SuperGenPass for Firefox

{
  "manifest_version": 2,
  "name": "SuperGenPass",
  "version": "1.0.1",
  "description": "Generate reproducible passwords based on a master password and a page's domain",
  "developer": {
    "name": "Mihail Milushev <mihail@lanzz.org>",
    "url": "https://github.com/lanzz"
  },
  "homepage_url": "https://github.com/lanzz/firefox-supergenpass",
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox-supergenpass@lanzz.org"
    }
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "menus",
    "storage"
  ],
  "icons": {
    "48": "assets/icon-48.png",
    "96": "assets/icon-96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "browser_action": {
    "default_title": "SuperGenPass Options",
    "default_popup": "options.html"
  },
  "page_action": {
    "default_icon": {
      "19": "assets/icon-19.png",
      "38": "assets/icon-38.png"
    },
    "default_title": "Generate Password",
    "default_popup": "generate.html",
    "show_matches": [
      "http://*/*",
      "https://*/*",
      "file:///*"
    ]
  }
}