Examine source code of Justification

{
  "manifest_version": 2,
  "name": "Justification",
  "version": "1.0.1",
  "description": "Justify and hyphenate (if site declares language) any paragraph or list.",
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  },
  "applications": {
    "gecko": {
      "id": "{865ef0c9-4859-40ba-b16b-3b21a6fae460}"
    }
  },
  "content_scripts": [
    {
      "css": [
        "style.css"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ]
}