Examine source code of CPC Link Crusher

{
  "manifest_version": 2,
  "name": "CPC Link Crusher",
  "version": "1.0",
  "description": "Quickly shorten links throught cpc.cx and copy them your clipboard",
  "homepage_url": "https://github.com/Kanabenki/cpc-link-crusher",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "tabs",
    "clipboardWrite",
    "notifications",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "browser_action": {
    "default_title": "CPC Link Crusher",
    "default_icon": "icons/icon-32.png"
  }
}