Examine source code of ERail Plugin for Firefox

{
  "manifest_version": 2,
  "background": {
    "scripts": [
      "js/jquery-3.2.1.min.js",
      "js/erailchrome.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "images/erail.png",
      "48": "images/erail48.png",
      "128": "images/erail128.png"
    },
    "default_popup": "popup.html",
    "default_title": "eRail.in"
  },
  "content_scripts": [
    {
      "js": [
        "js/jquery-3.2.1.min.js",
        "js/contentscript.js",
        "js/ocrad.js"
      ],
      "matches": [
        "*://*.erail.in/*",
        "*://*.eair.in/*",
        "*://*.irctc.co.in/*",
        "*://*.indianrail.gov.in/*",
        "*://*.makemytrip.com/*",
        "*://*.paytm.com/*"
      ]
    }
  ],
  "description": "This app provides enhanced user experience for eRail.in",
  "icons": {
    "16": "images/erail.png",
    "48": "images/erail48.png",
    "128": "images/erail128.png"
  },
  "name": "eRail.in",
  "short_name": "eRail.in",
  "omnibox": {
    "keyword": "erailir"
  },
  "permissions": [
    "cookies",
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "management",
    "contextMenus",
    "notifications",
    "unlimitedStorage",
    "*://*.erail.in/*",
    "*://*.eair.in/*",
    "*://*.irctc.co.in/*",
    "*://*.indianrail.gov.in/*",
    "*://*.makemytrip.com/*",
    "*://*.paytm.com/*"
  ],
  "version": "6.10resigned1",
  "browser_specific_settings": {
    "gecko": {
      "id": "ERAIL.IN.FFPLUGIN@jetpack"
    }
  }
}