Examine source code of Trello Shortcuts Killer

{
  "manifest_version": 2,
  "name": "Trello Shortcuts Killer",
  "version": "1.0.2",
  "description": "Remove shortcuts from Trello for people who don't use them",
  "permissions": [
    "*://trello.com/*"
  ],
  "icons": {
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://trello.com/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "author": "Sosthèn Gaillard",
  "browser_specific_settings": {
    "gecko": {
      "id": "{9208acb6-f304-470b-8ba9-70bf0b4c3163}"
    }
  }
}