Examine source code of Class Link Check for Google Classroom™

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Class Link Check for Google Classroom™",
  "description": "Checks for, opens and alerts the user about the meeting link being in the Google Classroom class.",
  "version": "0.0.0.2",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "backgroundScript.js"
    ],
    "page": [
      "backgroundScript.js"
    ],
    "service_worker": [
      "backgroundScript.js"
    ]
  },
  "icons": {
    "16": "./logos/Meet Check Icon16.png",
    "48": "./logos/Meet Check Icon48.png",
    "128": "./logos/Meet Check Icon.png"
  },
  "action": {
    "default_popup": "./popup/popup.html",
    "default_icon": {
      "16": "./logos/Meet Check Icon16.png",
      "32": "./logos/Meet Check Icon48.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://meet.google.com/_meet/*",
        "https://meet.google.com/lookup/*"
      ],
      "js": [
        "meetingPage.js"
      ]
    },
    {
      "matches": [
        "https://classroom.google.com/u/*/c/*",
        "https://classroom.google.com/c/*"
      ],
      "js": [
        "classroomPage.js"
      ]
    },
    {
      "matches": [
        "https://accounts.google.com/AccountChooser/*"
      ],
      "js": [
        "accountChooserPage.js"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "notifications"
  ]
}