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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "version": "1.0",
  "name": "Slack watch history",
  "description": "Slack watch history",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "action": {
    "default_icon": "images/icon16.png",
    "default_popup": "html/popup.html"
  },
  "background": {
    "service_worker": "background.js"
  },
  "permissions": [
    "background",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://app.slack.com/client/*/*"
      ],
      "js": [
        "js/jquery-3.6.0.min.js",
        "js/content.js"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self';"
  }
}