Examine source code of Fix Trello Boards Width

{
  "manifest_version": 2,
  "name": "Fix Trello Boards Width",
  "version": "1.1.1resigned1",
  "icons": {
    "16": "img/icon16.png",
    "32": "img/icon32.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "description": "Fix the container width of the Trello boards after latest UI update",
  "author": "Luke Denton <denno020@gmail.com>",
  "content_scripts": [
    {
      "matches": [
        "http://*.trello.com/*",
        "https://*.trello.com/*"
      ],
      "css": [
        "css/style.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b577c2bf-622d-43a1-b6f7-47d1afb133dd}"
    }
  }
}