Examine source code of remove-json-prefix

{
  "applications": {
    "gecko": {
      "id": "{b4eeb53a-9e58-472a-b1e4-8fa77950dfc1}"
    }
  },
  "manifest_version": 2,
  "name": "remove-json-prefix",
  "version": "2019.4.18",
  "description": "Remove JSon highjacking prefix. See https://haacked.com/archive/2008/11/20/anatomy-of-a-subtle-json-vulnerability.aspx/",
  "developer": {
    "name": "ncoif",
    "url": "https://github.com/ncoif/remove-json-prefix"
  },
  "icons": {
    "48": "icons/icon-active-48.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "browser_style": false,
    "default_icon": "icons/icon-active-32.png",
    "default_title": "Remove JSon prefix",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  }
}