Examine source code of Color Code Copier

{
  "manifest_version": 3,
  "name": "Color Code Copier",
  "version": "1.0",
  "description": "Pick any color from a webpage and copy its hex code.",
  "permissions": [
    "scripting",
    "activeTab",
    "clipboardWrite"
  ],
  "action": {
    "default_icon": "icon_48.png",
    "default_title": "Pick a Color"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icon_16.png",
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "color-picker@yourdomain.com",
      "strict_min_version": "109.0"
    }
  }
}