Examine source code of Kannada fonts package

{
  "manifest_version": 2,
  "name": "Kannada Font Pack",
  "description": "This extension allows the user to see the unicode fonts in Kannada even if their system does not support it.",
  "version": "2.0.4",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "gujfonts.css"
      ]
    }
  ]
}