Examine source code of Hide OGS ranks

{
  "manifest_version": 2,
  "name": "Hide OGS ranks",
  "version": "1.2",
  "description": "Hide player ranks on online-go.com.",
  "homepage_url": "https://github.com/stefankoegel/hide_ogs_ranks",
  "icons": {
    "48": "icons/hide_ogs_ranks_48.png",
    "96": "icons/hide_ogs_ranks_96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.online-go.com/*"
      ],
      "run_at": "document_end",
      "js": [
        "hide_ogs_ranks.js"
      ],
      "css": [
        "hide_ogs_ranks.css"
      ]
    }
  ]
}