Examine source code of EnterLearning

{
  "manifest_version": 3,
  "name": "EnterLearning",
  "version": "1.3.1",
  "description": "Adds various features on ItsLearning",
  "browser_specific_settings": {
    "gecko": {
      "id": "EnterLearning@13471398948"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.itslearning.com/*"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ],
  "permissions": [
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "*://*.itslearning.com/*"
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  }
}