Examine source code of Tab Color Changer

{
  "manifest_version": 2,
  "name": "Tab Color Coder",
  "version": "1.0",
  "description": "Assign colors to tabs based on their content or domain.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{77f08d4e-3ff3-439c-b506-e76ad117ac8f}"
    }
  }
}