Examine source code of Password Hasher NG

{
  "manifest_version": 2,
  "name": "Password Hasher NG",
  "version": "1.0.4resigned1",
  "applications": {
    "gecko": {
      "id": "passhash-ng@cnielsen.de"
    }
  },
  "description": "Implementation of the Password Hasher extension for the new Webextension API",
  "permissions": [
    "activeTab",
    "notifications",
    "storage",
    "contextMenus",
    "tabs"
  ],
  "icons": {
    "48": "icons/logo_48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "jquery-3.2.1.min.js",
        "content.js"
      ]
    }
  ],
  "page_action": {
    "default_title": "Hash password",
    "default_icon": {
      "48": "icons/logo_gr_48.png"
    },
    "default_popup": "popup.html",
    "browser_style": false
  },
  "commands": {
    "_execute_page_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+F6"
      }
    }
  }
}