Examine source code of Chat Pro For Salesforce

{
  "manifest_version": 3,
  "name": "Chat Pro For Salesforce",
  "version": "1.2",
  "description": "Restructures messy Salesforce email chains into a clean, modern chat interface.",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "action": {
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    },
    "default_title": "Chat Pro For Salesforce"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.salesforce.com/*",
        "*://*.force.com/*",
        "*://*.lightning.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}