Examine source code of PasswordMaker X

{
  "manifest_version": 2,
  "name": "PasswordMaker X",
  "description": "Generate per-website passwords based on a master one.",
  "homepage_url": "https://github.com/emersion/passwordmaker",
  "version": "0.2.2resigned1",
  "author": "emersion",
  "icons": {
    "16": "img/icon-16.png",
    "20": "img/icon-20.png",
    "32": "img/icon-32.png",
    "40": "img/icon-40.png",
    "48": "img/icon-48.png",
    "64": "img/icon-64.png",
    "72": "img/icon-72.png",
    "96": "img/icon-96.png",
    "128": "img/icon-128.png",
    "140": "img/icon-140.png",
    "300": "img/icon-300.png"
  },
  "offline_enabled": true,
  "applications": {
    "gecko": {
      "id": "passwordmaker@emersion.fr"
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_title": "PasswordMaker X",
    "default_icon": {
      "16": "img/icon-16.png",
      "20": "img/icon-20.png",
      "32": "img/icon-32.png",
      "40": "img/icon-40.png",
      "48": "img/icon-48.png",
      "64": "img/icon-64.png"
    },
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": true
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Space"
      }
    }
  }
}