Examine source code of Hex Color Grabber

{
  "manifest_version": 2,
  "name": "Hex Color Grabber",
  "version": "1.1",
  "description": "Click anywhere to copy exact pixel color; hover shows preview.",
  "permissions": [
    "activeTab",
    "tabs",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "./icons/icon-16.png",
      "64": "./icons/icon-64.png",
      "128": "./icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "./icons/icon-16.png",
    "64": "./icons/icon-64.png",
    "128": "./icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{41f991b9-066c-47c4-a626-7a168baae344}"
    }
  }
}