Examine source code of Trello Card Numbers

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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Trello Card Numbers",
  "description": "Display card numbers in Trello.",
  "version": "1.0",
  "manifest_version": 2,
  "icons": {
    "16": "icon-16x16.png",
    "48": "icon-48x48.png",
    "128": "icon-128x128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://trello.com/",
        "http://www.trello.com/",
        "https://trello.com/",
        "https://www.trello.com/"
      ],
      "css": [
        "index.css"
      ]
    }
  ]
}