Make Google Chat like Slack

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Make Google Chat like Slack",
  "description": "An extension to extend the Google Chat to have the basic functionality that Slack has.",
  "version": "0.1.1",
  "icons": {
    "16": "resources/90.png",
    "48": "resources/90.png",
    "128": "resources/128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "resources/90.png",
      "48": "resources/90.png",
      "128": "resources/128.png"
    }
  },
  "permissions": [
    "https://chat.google.com/*",
    "https://mail.google.com/*"
  ],
  "content_scripts": [
    {
      "js": [
        "bundle.min.js"
      ],
      "matches": [
        "https://chat.google.com/*",
        "https://mail.google.com/*"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "homepage_url": "https://github.com/SanCoder-Q/slackify-gchat"
}