Examine source code of Cmd+Scroll Zoom

{
  "manifest_version": 2,
  "name": "Cmd+Scroll Zoom",
  "version": "1.2",
  "description": "Zoom with a modifier+scroll, persists per-domain, fully configurable",
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_action": {
    "default_title": "Cmd+Scroll Zoom Settings",
    "default_popup": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "collected": false,
        "required": [
          "none"
        ]
      },
      "id": "{2ec677be-d892-4d2a-a2d9-888311ccfc83}"
    }
  }
}