Examine source code of Saste me

{
  "manifest_version": 2,
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "name": "Saste me",
  "version": "1.8resigned1",
  "description": "Search products at lowest price from Amazon, Flipkart, Snapdeal, Ebay, Paytm, Shopclues, Tatacliq, Homeshop18, etc.",
  "background": {
    "scripts": [
      "./background.js"
    ]
  },
  "permissions": [
    "tabs",
    "notifications",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "*://*/*",
    "background",
    "pageCapture",
    "tabCapture",
    "tts",
    "alarms",
    "contextMenus",
    "identity",
    "webNavigation",
    "unlimitedStorage",
    "gcm"
  ],
  "browser_action": {
    "name": "Saste me",
    "default_icon": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "extcss.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{685f612c-7208-4b9e-9780-f1415ba0ee54}"
    }
  }
}