Examine source code of Image Resizer v2

{
  "manifest_version": 2,
  "name": "Image Resizer",
  "version": "1.0",
  "description": "Quickly resize images on any webpage.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c7ee0a1e-691e-4277-b04f-f07eb6735941}"
    }
  }
}