Examine source code of Gematria Calculator

{
  "manifest_version": 2,
  "name": "Gematria Calculator",
  "version": "1.0",
  "description": "Calculate Gematria values of highlighted text.",
  "permissions": [
    "storage",
    "activeTab",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/favicon-16x16.png"
    }
  },
  "icons": {
    "16": "icons/favicon-16x16.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "commands": {
    "calculate-gematria": {
      "suggested_key": {
        "default": "Ctrl+Q",
        "mac": "Command+Q"
      },
      "description": "Calculate Gematria for highlighted text"
    }
  },
  "applications": {
    "gecko": {
      "id": "your-addon-id@domain.com"
    }
  }
}