Examine source code of ViaBill

{
  "name": "ViaBill",
  "short_name": "ViaBill",
  "author": "Five Points Digital",
  "homepage_url": "https://www.viabill.com",
  "description": "Pay with ViaBill",
  "version": "0.0.2",
  "default_locale": "en",
  "manifest_version": 2,
  "icons": {
    "16": "images/icon_16.png",
    "19": "images/icon_19.png",
    "32": "images/icon_32.png",
    "38": "images/icon_38.png",
    "128": "images/icon_128.png",
    "256": "images/icon_256.png",
    "512": "images/icon_512.png"
  },
  "page_action": {
    "default_icon": {
      "16": "images/icon_16.png",
      "19": "images/icon_19.png",
      "32": "images/icon_32.png",
      "38": "images/icon_38.png",
      "128": "images/icon_128.png",
      "256": "images/icon_256.png",
      "512": "images/icon_512.png"
    },
    "default_title": "ViaBill",
    "default_popup": "html/popup.html"
  },
  "background": {
    "scripts": [
      "js/lib/jquery-3.3.1.min.js",
      "js/lib/materialize.min.js",
      "js/browser-polyfill.js",
      "js/detector.js",
      "js/driver.js",
      "js/lib/network.js",
      "js/lib/axios.js",
      "js/auth.js",
      "js/autofill.js",
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "exclude_matches": [
        "https://*.viabill.com/*"
      ],
      "js": [
        "js/browser-polyfill.js",
        "js/injectViabill.js",
        "js/content.js",
        "js/lib/jquery-3.3.1.min.js",
        "js/lib/materialize.min.js",
        "js/lib/axios.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "exclude_matches": [
        "https://*.viabill.com/*"
      ],
      "js": [
        "js/browser-polyfill.js",
        "js/lib/iframe.js",
        "js/lib/jquery-3.3.1.min.js",
        "js/autofill.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "css/*",
    "js/*",
    "html/*",
    "images/*"
  ],
  "permissions": [
    "cookies",
    "storage",
    "identity",
    "tabs",
    "webRequest",
    "webNavigation",
    "alarms",
    "http://*/*",
    "https://*/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'"
}