Examine source code of ID50 Password Manager

{
  "manifest_version": 2,
  "author": "Elias Rabl - IDENTsmart GmbH",
  "version": "1.3.5",
  "name": "__MSG_manifest_name__",
  "description": "__MSG_manifest_description__",
  "homepage_url": "__MSG_manifest_homepage__",
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "pwm-id50@identos.com"
    }
  },
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "64": "images/icon-64.png"
  },
  "permissions": [
    "tabs",
    "webRequest",
    "menus",
    "notifications",
    "storage",
    "privacy",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches:": [
        "about:*",
        "file:///*"
      ],
      "all_frames": true,
      "run_at": "document_end",
      "js": [
        "js/jquery-3.2.1.min.js",
        "js/jquery.popupoverlay.js",
        "js/inject.js"
      ],
      "css": [
        "css/tooltip.css"
      ]
    },
    {
      "matches": [
        "https://identsmart.com/support/support-id50-passwort-manager",
        "https://identsmart.com/en/support-en/support-id50-password-manager",
        "https://identsmart.com/support/support-id50-passwort-manager/*",
        "https://identsmart.com/en/support-en/support-id50-password-manager/*"
      ],
      "all_frames": true,
      "run_at": "document_end",
      "js": [
        "js/jquery-3.2.1.min.js",
        "js/support.js"
      ]
    }
  ],
  "options_ui": {
    "browser_style": true,
    "page": "html/options.html"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "browser_style": false,
    "default_title": "__MSG_manifest_name__",
    "default_popup": "html/options_panel.html",
    "default_icon": {
      "16": "images/icon-16.png",
      "32": "images/icon-32.png",
      "64": "images/icon-64.png"
    }
  },
  "web_accessible_resources": [
    "images/inject/*.png"
  ]
}