Examine source code of Search on GitHub

{
  "manifest_version": 2,
  "name": "Search on GitHub",
  "version": "1.0",
  "description": "Use right-click to launch GitHub search for selected text directly from context menu into new tab",
  "author": "Patrice Kenmoé",
  "homepage_url": "https://github.com/kevin-garnette",
  "icons": {
    "16": "iconfinder_mark-github_16.png",
    "32": "GitHub-Mark-32px.png",
    "48": "iconfinder_mark-github_128.png",
    "64": "GitHub-Mark-64px.png",
    "96": "5347-github_96.png",
    "128": "iconfinder_mark-github_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "contextMenus"
  ]
}