Examine source code of NflxMultiSubs_ST

{
  "short_name": "NflxMultiSubs_ST",
  "version": "2.1.2",
  "name": "NflxMultiSubs_ST",
  "manifest_version": 2,
  "author": "TheFantas",
  "permissions": [
    "storage",
    "https://www.netflix.com/watch/*",
    "https://assets.nflxext.com/*"
  ],
  "background": {
    "scripts": [
      "background.min.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon-gray.png",
    "default_popup": "settings.html"
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "128": "icon128.png",
    "512": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.netflix.com/*"
      ],
      "js": [
        "content.min.js"
      ],
      "run_at": "document_start"
    }
  ],
  "externally_connectable": {
    "matches": [
      "https://www.netflix.com/*"
    ]
  },
  "web_accessible_resources": [
    "nflxmultisubs.min.js"
  ]
}