Merge all tabs for print or save

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Merge all tabs for print or save",
  "description": "Convert entire website to PDF file",
  "icons": {
    "24": "printer24x24.png",
    "48": "printer48x48.png",
    "64": "printer64x64.png"
  },
  "version": "2.1.1",
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {}
}