Examine source code of Block copier

{
  "manifest_version": 2,
  "name": "Block copier",
  "version": "1.0",
  "description": "Copies html structure with css recursively",
  "icons": {
    "128": "./logo128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "permissions": [
    "<all_urls>",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "./logo128.png",
    "default_title": "Block copier",
    "default_popup": "./popup.html"
  }
}