Text into Multiple Columns

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Text into Multiple Columns",
  "version": "0.9.4",
  "manifest_version": 2,
  "description": "Reformats selected text to use columns of a more readable width.",
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "text-columns.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "cols.png",
    "default_title": "Display selected text in multiple columns."
  }
}