Examine source code of Environment Highlighter

{
  "manifest_version": 3,
  "name": "Environment Highlighter",
  "version": "1.0.0",
  "description": "Highlight specific URLs with custom banner text and color.",
  "author": "Emiel Hemminga @ snuggr",
  "action": {
    "default_title": "Environment Highlighter",
    "default_icon": "icon_128.png"
  },
  "options_page": "options.html",
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icon_128.png",
    "48": "icon_128.png",
    "128": "icon_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "environment-highlighter@snuggr.io",
      "strict_min_version": "109.0"
    }
  }
}