Better Open and Close Tabs

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Better Open and Close Tabs",
  "description": "Don't close pinned tabs on cmd-W. Open and close tabs in predictable way.",
  "version": "1.0.2",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "options_page": "options.html",
  "browser_action": {
    "default_icon": "icon96.png",
    "default_title": "Press Command+W to close and Command+T to open tabs"
  },
  "commands": {
    "close-current-tab": {
      "suggested_key": {
        "default": "Ctrl+W",
        "mac": "Command+W"
      },
      "description": "Close current tab, activate tab to right"
    },
    "add-a-new-tab": {
      "suggested_key": {
        "default": "Ctrl+T",
        "mac": "Command+T"
      },
      "description": "Opens new tab to the right of current tab"
    }
  },
  "icons": {
    "16": "icon96.png",
    "32": "icon96.png",
    "48": "icon96.png",
    "128": "icon96.png"
  }
}