Examine source code of RFC Reader

{
  "manifest_version": 2,
  "name": "RFC Reader",
  "short_name": "RFC Reader",
  "offline_enabled": true,
  "permissions": [
    "http://tools.ietf.org/*",
    "https://tools.ietf.org/*",
    "http://datatracker.ietf.org/*",
    "https://datatracker.ietf.org/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://tools.ietf.org/html/*",
        "https://tools.ietf.org/html/*",
        "http://datatracker.ietf.org/doc/html/*",
        "https://datatracker.ietf.org/doc/html/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "omnibox": {
    "keyword": "gorfc"
  },
  "background": {
    "persistent": false,
    "scripts": [
      "background-script.js"
    ]
  },
  "author": "Petr Flaks",
  "browser_specific_settings": {
    "gecko": {
      "id": "{755d8e2c-7b6b-4c41-84c1-a4a5b1a09c0d}",
      "strict_min_version": "48.0"
    }
  },
  "description": "Simple extension that makes IEFT's RFCs more eye friendly.",
  "homepage": "https://github.com/flaksp/rfc-reader",
  "icons": {
    "96": "ic_find_in_page_black_48dp.png"
  },
  "version": "1.2.4.8",
  "version_name": "1.2.4 build 8"
}