Examine source code of Image Resize Generator

{
  "manifest_version": 2,
  "name": "Image Resize Generator",
  "description": "resize your icons and images quickly and efficiently.",
  "version": "1.0.0",
  "icons": {
    "32": "icons/32.png",
    "64": "icons/64.png",
    "128": "icons/128.png",
    "256": "icons/256.png"
  },
  "browser_action": {
    "default_title": "Icon Resize Generator",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "worker.js"
    ]
  },
  "permissions": [
    "tabs",
    "cookies",
    "storage",
    "browsingData",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b999ff7b-9d6a-404c-9540-3944139fee78}"
    }
  }
}