Examine source code of Key Generator

{
  "manifest_version": 2,
  "name": "Key Generator",
  "version": "1.0",
  "description": "Key Generator on Key press",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon16.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8020fb9a-7622-4ac0-bffa-d200f9d0de21}"
    }
  }
}