Middle click opens tabs in background

manifest.json

{
  "update_url": "http://clients2.google.com/service/update2/crx",
  "name": "Middle click opens tabs in background",
  "version": "1.4.1.2",
  "manifest_version": 2,
  "minimum_chrome_version": "23",
  "description": "For those who are suffering from \"Issue 62319: Middle Click with named Target opening in foreground\".",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "tabs"
  ],
  "content_scripts": [
    {
      "js": [
        "open_in_background.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*",
        "ftp://*/*"
      ],
      "run_at": "document_start"
    }
  ],
  "options_page": "options.html",
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}