Examine source code of EV Optimizer

{
  "manifest_version": 2,
  "name": "EV Optimizer",
  "version": "1.0",
  "description": "Optimize your Pokémon's EV spread easily.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9760e824-2e31-4bbd-8030-1c87f9aac79b}"
    }
  }
}