Examine source code of Line Highlighter

{
  "manifest_version": 2,
  "name": "Line Highlighter",
  "description": "Highlight lines of text by hovering over them to improve focus.",
  "version": "0.1.0",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "images/16.png",
      "48": "images/48.png",
      "128": "images/128.png"
    }
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options/options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/highlight.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{836664c9-0ed2-4563-ad56-6084ada05b36}"
    }
  }
}