Examine source code of Tab Rearranger

{
  "name": "Tab Rearranger",
  "version": "1.1.0",
  "manifest_version": 2,
  "description": "Rearrange tabs using keyboard shortcuts",
  "background": {
    "scripts": [
      "rearrange.js"
    ],
    "persistent": false
  },
  "permissions": [
    "tabs"
  ],
  "commands": {
    "move-tab-left": {
      "suggested_key": {
        "default": "Shift+Alt+Left",
        "windows": "Shift+Alt+Left",
        "mac": "MacCtrl+Shift+Left"
      },
      "description": "Move active tab left"
    },
    "move-tab-right": {
      "suggested_key": {
        "default": "Shift+Alt+Right",
        "windows": "Shift+Alt+Right",
        "mac": "MacCtrl+Shift+Right"
      },
      "description": "Move active tab right"
    },
    "move-tab-to-next-window": {
      "suggested_key": {
        "default": "Shift+Alt+Up",
        "windows": "Shift+Alt+Up",
        "mac": "MacCtrl+Shift+Up"
      },
      "description": "Move active tab to next window"
    },
    "move-tab-to-new-window": {
      "suggested_key": {
        "default": "Shift+Alt+N",
        "windows": "Shift+Alt+N",
        "mac": "MacCtrl+Shift+N"
      },
      "description": "Move active tab to new window"
    },
    "move-multiple-tabs-to-new-window": {
      "suggested_key": {
        "default": "Shift+Alt+M",
        "windows": "Shift+Alt+M",
        "mac": "MacCtrl+Shift+M"
      },
      "description": "Move multiple tabs to new window"
    }
  }
}