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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Trello Extended",
  "description": "",
  "version": "1.3",
  "author": "Mitko Tochev",
  "content_scripts": [
    {
      "matches": [
        "https://trello.com/*"
      ],
      "js": [
        "js/jquery-2.2.3.min.js",
        "js/card_colors.js"
      ],
      "css": [
        "css/card_colors.css"
      ]
    }
  ]
}