Examine source code of Traceforce

{
  "manifest_version": 2,
  "name": "Salesforce MessagingSession Explorer",
  "version": "2.0.0",
  "description": "Fetches MessagingSession history from Salesforce and analyzes agent wait times, misses and transfers.",
  "permissions": [
    "storage",
    "tabs",
    "cookies",
    "activeTab",
    "https://*.salesforce.com/*",
    "https://*.force.com/*",
    "https://*.my.salesforce.com/*",
    "https://*.salesforce-setup.com/*",
    "https://*.develop.my.salesforce.com/*",
    "https://*.develop.my.salesforce-setup.com/*"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Open MessagingSession Explorer"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "sf-messaging-explorer@extension",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}