Examine source code of Amazon Switcher

{
  "manifest_version": 2,
  "name": "Amazon Switcher",
  "version": "1.0",
  "description": "Wechselt automatisch von amazon.com auf amazon.de.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "amazon-switcher@flibbo.de",
      "strict_min_version": "58.0"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  }
}