Examine source code of Github Punchcard

{
  "manifest_version": 2,
  "name": "Github Punchcard",
  "version": "1.7resigned1",
  "description": "Make Github Punchcard great again!",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Github Punchcard",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true,
    "open_in_tab": true
  },
  "permissions": [
    "tabs",
    "storage",
    "https://api.github.com/*",
    "https://github.com/*"
  ],
  "content_scripts": [
    {
      "js": [
        "content.js",
        "PunchCard.js"
      ],
      "css": [
        "PunchCard.css"
      ],
      "matches": [
        "https://github.com/*"
      ],
      "run_at": "document_start"
    },
    {
      "js": [
        "intro.js"
      ],
      "css": [
        "introjs.css"
      ],
      "matches": [
        "https://github.com/settings/tokens/new"
      ]
    }
  ],
  "web_accessible_resources": [
    "background.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{981a523b-c945-464f-be10-2a68c485d0e9}"
    }
  }
}