Examine source code of Focus Column for Trello

{
  "manifest_version": 3,
  "name": "Focus Column for Trello",
  "version": "1.1.1",
  "description": "Focus on a single Trello column in your browser sidebar",
  "browser_specific_settings": {
    "gecko": {
      "id": "news@shareables.ai",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "websiteContent"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "contextMenus"
  ],
  "host_permissions": [
    "https://api.trello.com/*",
    "https://trello.com/*",
    "https://shareables.ai/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "options/callback.html"
      ],
      "matches": [
        "https://trello.com/*"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "https://trello.com/b/*"
      ],
      "js": [
        "content/trello-inject.js"
      ],
      "css": [
        "content/trello-inject.css"
      ]
    },
    {
      "matches": [
        "https://shareables.ai/tools/focus-column-for-trello/trello-callback*"
      ],
      "js": [
        "content/callback-inject.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "service-worker.js"
    ]
  },
  "sidebar_action": {
    "default_panel": "sidepanel/sidepanel.html",
    "default_title": "Focus Column for Trello",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png"
    }
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "action": {
    "default_title": "Open Focus Column for Trello"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}