Examine source code of KeyReel FREE Password Manager & Secret Vault

{
  "manifest_version": 2,
  "name": "KeyReel Password Manager Companion",
  "short_name": "KeyReel",
  "author": "Auxoft LLC",
  "description": "KeyReel companion web-extension to perform forms auto-filling and auto-login. It requires the KeyReel app on both desktop and phone.",
  "version": "20.9.24.2",
  "homepage_url": "https://www.keyreel.io",
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "keyreel@keyreel.io",
      "strict_min_version": "57.0"
    }
  },
  "icons": {
    "16": "img/icon_16.png",
    "48": "img/icon_48.png",
    "128": "img/icon_128.png"
  },
  "background": {
    "scripts": [
      "js/browser-polyfill.min.js",
      "js/background.min.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "all_frames": true,
      "match_about_blank": true,
      "run_at": "document_start",
      "js": [
        "js/browser-polyfill.min.js",
        "js/content.min.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*"
      ]
    }
  ],
  "permissions": [
    "nativeMessaging",
    "storage",
    "webNavigation",
    "activeTab",
    "privacy",
    "http://*/*",
    "https://*/*",
    "file://*/*",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "img/browser_action_icon_inactive_38x38.png",
    "default_title": "KeyReel Service is not running",
    "default_popup": "popup.html"
  },
  "web_accessible_resources": [
    "img/*.png",
    "js/*.map",
    "js/*.js",
    "css/*.css"
  ]
}