Examine source code of Highlight Text

{
  "manifest_version": 2,
  "name": "Highlight Text",
  "version": "1.0",
  "description": "Highlight selected text on web pages.",
  "permissions": [
    "storage",
    "activeTab",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{dccbb296-8ffa-4139-a8f8-f89603a31625}"
    }
  }
}