Examine source code of Website Colors Finder

{
  "manifest_version": 3,
  "name": "Website Colors Finder",
  "version": "1.0",
  "description": "Get all the colors used on a website",
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "128": "128x128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "action": {
    "default_icon": "128x128.png",
    "default_title": "Website Colors Finder",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "golapyd@gmail.com",
      "strict_min_version": "42.0"
    }
  }
}