Examine source code of Secure Kit

{
  "manifest_version": 3,
  "minimum_chrome_version": "88",
  "name": "__MSG_appname__",
  "version": "1.3.5",
  "description": "__MSG_appdesc__",
  "default_locale": "en",
  "icons": {
    "128": "img/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a05e143a-65ac-4a29-829e-12d16d7a9c74}",
      "strict_min_version": "126.0"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "img/eye.svg",
        "img/close.svg",
        "inject/setTimezone.js",
        "inject/setGeo.js",
        "inject/setDisabledWebRTC.js",
        "inject/setUserAgent.js",
        "inject/setBrowserLanguage.js",
        "inject/setDisabledFingerprints.js",
        "inject/setDisabledJava.js",
        "inject/setDNT.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_icon": "img/icon128.png",
    "default_popup": "html/popup.html"
  },
  "permissions": [
    "storage",
    "privacy",
    "tabs",
    "proxy",
    "browsingData",
    "webRequest",
    "webRequestAuthProvider",
    "declarativeNetRequest",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "js/lib/jquery-3.2.1.min.js",
        "js/lib/notify.js",
        "js/content.js"
      ],
      "matches": [
        "*://*/*"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}