Examine source code of Github Merge Helper

{
  "manifest_version": 2,
  "name": "Github Merge Helper",
  "version": "0.0.5resigned1",
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://github.com/*"
      ],
      "js": [
        "gmh.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6d5bad52-e4f6-4be9-b570-ba2dfa540dd4}"
    }
  }
}