Restore old Google icons

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Restore old Google icons",
  "description": "Restore the old icon on Meet, Calendar and Gmail to make tabs more recognizable",
  "version": "0.1",
  "content_scripts": [
    {
      "matches": [
        "*://calendar.google.com/*"
      ],
      "js": [
        "calendar_script.js"
      ]
    },
    {
      "matches": [
        "*://docs.google.com/*"
      ],
      "js": [
        "docs_script.js"
      ]
    },
    {
      "matches": [
        "*://drive.google.com/*"
      ],
      "js": [
        "drive_script.js"
      ]
    },
    {
      "matches": [
        "*://mail.google.com/*"
      ],
      "js": [
        "gmail_script.js"
      ]
    },
    {
      "matches": [
        "*://meet.google.com/*"
      ],
      "js": [
        "meet_script.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icon16.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  }
}