Examine source code of GitHub Story Points

{
  "manifest_version": 2,
  "name": "GitHub Story Points",
  "description": "Chrome extension to see story points in GitHub projects",
  "short_name": "GitHub Story Points",
  "version": "0.3.0",
  "author": "Kohei Hasegawa",
  "homepage_url": "https://github.com/banyan/github-story-points",
  "icons": {
    "16": "assets/images/icon.png",
    "48": "assets/images/icon.png",
    "128": "assets/images/icon.png"
  },
  "permissions": [
    "https://github.com/*",
    "contextMenus",
    "activeTab"
  ],
  "optional_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "dist/background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*/*/projects/*"
      ],
      "js": [
        "dist/story-points.js"
      ]
    }
  ]
}