Examine source code of Password Boss

{
  "homepage_url": "https://www.passwordboss.com/",
  "name": "__MSG_appName__",
  "version": "5.7.122",
  "manifest_version": 2,
  "description": "__MSG_appDescription__",
  "browser_specific_settings": {
    "gecko": {
      "id": "passwordboss4ff@passwordboss.com",
      "strict_min_version": "110.0"
    }
  },
  "icons": {
    "16": "images/icon-16.png",
    "19": "images/icon-19.png",
    "32": "images/icon-32.png",
    "38": "images/icon-38.png",
    "128": "images/icon-128.png"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "scripts/background/background-firefox.min.js"
    ]
  },
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "19": "images/icon-19-grey.png",
      "38": "images/icon-38-grey.png"
    },
    "default_title": "Password Boss"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "match_about_blank": true,
      "js": [
        "vendors/punycode-1.4.1.min.js",
        "vendors/jquery-3.3.1.min.js",
        "vendors/jquery.livequery.min.js",
        "scripts/content-script/content-firefox.min.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "permissions": [
    "tabs",
    "management",
    "nativeMessaging",
    "webNavigation",
    "contextMenus",
    "<all_urls>",
    "http://*/*",
    "https://*/*"
  ],
  "web_accessible_resources": [
    "frame/*"
  ]
}