Examine source code of CSS Color Highlighter

{
  "manifest_version": 2,
  "name": "CSS Color Highlighter",
  "version": "2.0",
  "description": "Highlights all CSS colors with smart parsing",
  "permissions": [
    "storage",
    "activeTab",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "css-color-highlighter@avasay-sayava",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_title": "Toggle Color Highlighter",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "common.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "common.js",
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ]
}