Examine source code of Nash Extension

{
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "browser_action": {
    "default_icon": "assets/nash_128.png",
    "default_popup": "popup.html",
    "default_title": "Nash"
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "*://localhost/*",
        "*://*.neonexchange.org/*",
        "*://*.nash.io/*",
        "*://*.neontest.org/*"
      ],
      "run_at": "document_start"
    }
  ],
  "description": "Blockchain Browser Extension",
  "icons": {
    "16": "assets/nash_16.png",
    "48": "assets/nash_48.png",
    "128": "assets/nash_128.png"
  },
  "manifest_version": 2,
  "name": "Nash Extension",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "downloads",
    "tabs",
    "storage",
    "activeTab"
  ],
  "version": "1.0.3"
}