Examine source code of Compare amazon products

{
  "description": "Right-click tool to compare Amazon Products side-by-side",
  "manifest_version": 2,
  "name": "Compare Amazon product features",
  "version": "4.0.5",
  "homepage_url": "https://www.featurecompare.com",
  "icons": {
    "16": "./icons/16.png",
    "48": "./icons/48.png",
    "64": "./icons/64.png",
    "96": "./icons/96.png",
    "128": "./icons/128.png"
  },
  "permissions": [
    "contextMenus",
    "notifications",
    "*://www.featurecompare.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "./icons/128.png",
    "default_title": "Feature Compare tool",
    "default_popup": "popup/popup.html"
  }
}