Examine source code of HandySwitch

{
  "name": "HandySwitch",
  "description": "Handy tool for Drupal CMS Web editing",
  "version": "0.1",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "tabs",
    "webNavigation"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {},
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "commands": {
    "switch_to_editing_page": {
      "suggested_key": {
        "default": "Ctrl+Shift+Right",
        "mac": "MacCtrl+Shift+Right"
      },
      "description": "go forward"
    },
    "switch_to_ordinary_page": {
      "suggested_key": {
        "default": "Ctrl+Shift+Left",
        "mac": "MacCtrl+Shift+Left"
      },
      "description": "go back"
    }
  },
  "icons": {
    "48": "icon.png"
  }
}