Alt+Up

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Alt+Up",
  "description": "Go to parent address. Use Alt+Up to move up one level like in many file browsers.",
  "version": "1.0.3",
  "author": "Daniel Forssten",
  "manifest_version": 2,
  "minimum_chrome_version": "29",
  "permissions": [
    "tabs"
  ],
  "icons": {
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "up:1": {
      "suggested_key": {
        "default": "Alt+Up",
        "mac": "Command+Up"
      },
      "description": "Go up one level"
    },
    "up:-1": {
      "description": "Go up to domain root level"
    },
    "up:-1:path": {
      "description": "Go up to subdomain root level"
    }
  }
}