Examine source code of Asin IO

{
  "manifest_version": 2,
  "name": "Asin IO",
  "description": "Discover products you can turn into profits at Amazon.",
  "version": "1.2resigned1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "applications": {
    "gecko": {
      "id": "{c1fb8e12-a4e0-477f-9933-e657d24f23f0}",
      "strict_min_version": "45.0"
    }
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png"
    },
    "default_title": "Asin IO Opt-in",
    "default_popup": "popup/opt-in.html"
  },
  "page_action": {
    "browser_style": true,
    "default_icon": {
      "19": "images/icon19.png",
      "38": "images/icon38.png"
    },
    "default_title": "asin.io",
    "show_matches": [
      "https://www.amazon.com/*",
      "https://www.amazon.ca/*",
      "https://www.amazon.co.uk/*",
      "https://www.amazon.es/*",
      "https://www.amazon.it/*",
      "https://www.amazon.de/*",
      "https://www.amazon.fr/*",
      "https://www.amazon.in/*",
      "https://www.amazon.cn/*",
      "https://www.amazon.co.jp/*",
      "https://www.amazon.com.mx/*",
      "https://www.amazon.com.br/*",
      "https://www.amazon.com.au/*"
    ]
  },
  "permissions": [
    "tabs",
    "storage"
  ]
}