Examine source code of WesternRMP

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "WesternRMP",
  "description": "See RateMyProfessors.com ratings in Western University's DraftMySchedule.",
  "version": "1.1",
  "icons": {
    "128": "assets/icon128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "https://draftmyschedule.uwo.ca/*",
    "https://www.ratemyprofessors.com/*",
    "https://ratemyprofessors.com/*"
  ],
  "optional_permissions": [
    "webNavigation",
    "tabs"
  ],
  "background": {
    "service_worker": "background.js",
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "https://draftmyschedule.uwo.ca/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}