Examine source code of Trello Legacy Labels

{
  "manifest_version": 2,
  "name": "Trello Legacy Labels",
  "version": "1.5",
  "description": "Restores the legacy labels for Trello",
  "homepage_url": "https://github.com/DamienDessagne/TrelloLegacyLabels",
  "icons": {
    "48": "icons/trello-legacy-labels-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.trello.com/*"
      ],
      "js": [
        "legacylabels.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ee2b15d8-3d0d-4bd8-a062-3bff1789d11f}"
    }
  }
}