Recent Colors for Google Doc

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Recent Colors for Google Doc",
  "description": "Can't tell how green or blue your last selected color was? I feel your pain.",
  "version": "0.1.1",
  "manifest_version": 3,
  "background": {
    "service_worker": "background.js"
  },
  "permissions": [
    "storage",
    "tabs",
    "webRequest"
  ],
  "host_permissions": [
    "*://docs.google.com/"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://docs.google.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content_script.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}