Examine source code of BestMetricConversion Converter

{
  "manifest_version": 2,
  "name": "Best Metric Conversion Sidebar",
  "description": "Quick conversions for weight, length, volume, temperature, currency, crypto, and more on bestmetriconversion.com.",
  "version": "1.0.0",
  "browser_action": {
    "default_title": "Open converter sidebar",
    "default_icon": {
      "128": "icons/icon.png"
    }
  },
  "sidebar_action": {
    "default_title": "Best Metric Conversion",
    "default_panel": "sidepanel.html",
    "default_icon": "icons/icon.png",
    "open_at_install": false
  },
  "permissions": [
    "tabs",
    "storage",
    "https://bestmetriconversion.com/*",
    "https://open.er-api.com/*",
    "https://api.frankfurter.app/*",
    "https://api.coingecko.com/*"
  ],
  "background": {
    "scripts": [
      "firefox-background.js"
    ]
  },
  "icons": {
    "128": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "best-metric-conversion-sidebar@example.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}