Examine source code of Next Meeting

{
  "name": "Next Meeting",
  "description": "Enhances Google Meet meetings including adding a button that lets you join the next meeting on your calendar directly from the current one.",
  "version": "1.4.3",
  "manifest_version": 2,
  "icons": {
    "16": "img/16.png",
    "32": "img/32.png",
    "48": "img/48.png",
    "128": "img/128.png",
    "168": "img/168.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://meet.google.com/*-*-*"
      ],
      "js": [
        "contentScript.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "identity",
    "https://sheets.googleapis.com/*",
    "https://www.googleapis.com/calendar/v3/*",
    "https://246omlcqh4.execute-api.us-east-1.amazonaws.com/NextMeeting",
    "https://*.meet.google.com/*",
    "https://*.googleusercontent.com/*"
  ],
  "web_accessible_resources": [
    "overrideUserMedia.js",
    "*.png",
    "*.gif",
    "*.mov",
    "*.jpg",
    "*.webm",
    "TranscriptTemplate.html",
    "emojis.json",
    "emojipicker.html",
    "NotoColorEmoji.ttf"
  ],
  "page_action": {
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "popup.html"
  },
  "commands": {
    "getFocus": {
      "suggested_key": {
        "default": "Alt+M"
      },
      "description": "Go to tab with active meeting."
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "oauth2": {
    "client_id": "201622396375-vvri987as34nrnv56hgff2iekiq7j00s.apps.googleusercontent.com",
    "scopes": [
      "https://www.googleapis.com/auth/drive.file"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "nextmeeting@stnc.com",
      "strict_min_version": "60.0"
    }
  }
}