Examine source code of SGW eBay Comparator

{
  "manifest_version": 2,
  "name": "SGW eBay Comparator",
  "version": "1.0",
  "description": "Easily compare prices on eBay for items found on shopgoodwill.com.",
  "permissions": [
    "contextMenus",
    "tabs",
    "activeTab"
  ],
  "icons": {
    "48": "icon.png"
  },
  "background": {
    "scripts": [
      "popup.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e621681b-bfd6-4120-bb60-7e0e299573f9}"
    }
  }
}