Examine source code of Hackollapse

{
  "name": "Hackollapse",
  "version": "1.0",
  "description": "Collapse comment threads on Hacker News!",
  "permissions": [
    "storage",
    "tabs"
  ],
  "page_action": {
    "show_matches": [
      "https://news.ycombinator.com/*"
    ],
    "default_title": "Hackollapse",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/wrecking-ball.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://news.ycombinator.com/item?id=*"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "icons": {
    "16": "images/wrecking-ball.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "manifest_version": 2
}