Examine source code of WLocker

{
  "manifest_version": 2,
  "homepage_url": "https://koffiisen.github.io/WLocker/",
  "author": "Koffi ONIPOH",
  "name": "WLocker",
  "description": "Free navigator extension wo allow to lock any website",
  "version": "1.0",
  "icons": {
    "64": "icons/tblock64.png",
    "128": "icons/tblock128.png",
    "256": "icons/tblock256.png",
    "512": "icons/tblock.png"
  },
  "browser_action": {
    "default_icon": "icons/tblock.png",
    "default_popup": "page/popup.html",
    "default_title": "TBLocker"
  },
  "content_scripts": [
    {
      "css": [
        "css/lock.css"
      ],
      "js": [
        "libs/jquery-3.4.1.min.js",
        "libs/devtools-detect.js",
        "js/dom.js",
        "libs/animate.min.js",
        "js/utils.js",
        "js/lock.js",
        "js/content.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "permissions": [
    "storage",
    "contextMenus",
    "activeTab"
  ],
  "options_ui": {
    "page": "page/options.html",
    "open_in_tab": false
  },
  "background": {
    "scripts": [
      "js/utils.js",
      "js/ctxm.js"
    ],
    "persistent": true
  },
  "default_locale": "en"
}