Examine source code of UUID Filler

{
  "name": "UUID Filler",
  "description": "Easily fill text fields with a randomly generated UUID!",
  "version": "0.1.2",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "menus",
    "scripting",
    "activeTab"
  ],
  "icons": {
    "16": "16px.png",
    "32": "32px.png",
    "48": "48px.png",
    "128": "128px.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f6573a7f-5759-4b22-89bc-6a40f6803b09}"
    }
  }
}