Examine source code of TDEE Calculator

{
  "manifest_version": 2,
  "name": "TDEE Calculator",
  "version": "1.0",
  "description": "Perfect calorie calculator for gaining weight, building muscle, and fat loss optimization",
  "permissions": [],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "images/teed-logo.png"
    }
  },
  "icons": {
    "128": "images/teed-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{62874236-6822-4e77-8bbf-d0f8f869c641}"
    }
  }
}