Examine source code of Github Better Comments

{
  "manifest_version": 2,
  "name": "Github Better Comments",
  "author": "Sharad Raj Singh Maurya",
  "developer": {
    "name": "Sharad Raj Singh Maurya",
    "url": "https://github.com/sharadcodes/github-better-comments-extension"
  },
  "description": "Adds colors to comments on Github files (*-*)",
  "version": "0.0.1",
  "icons": {
    "16": "icons/icon16.png",
    "19": "icons/icon19.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "*://*.github.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "data/gbc.js"
      ],
      "css": [
        "data/gbc.css"
      ],
      "run_at": "document_end"
    }
  ]
}