Examine source code of Cloud Tabs

{
  "manifest_version": 2,
  "name": "Cloud Tabs",
  "description": "Store your opened tabs in the cloud or in local database",
  "version": "1.31",
  "icons": {
    "16": "i/icon16.png",
    "48": "i/icon48.png",
    "128": "i/icon128.png"
  },
  "permissions": [
    "tabs",
    "https://nyashi.ru/*"
  ],
  "browser_action": {
    "default_icon": {
      "19": "i/icon19.png",
      "38": "i/icon38.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_page": "index.html",
  "content_security_policy": "script-src 'self'; object-src 'self'"
}