Examine source code of Simple Window Resizer

{
  "applications": {
    "gecko": {
      "id": "window.resizer@soustruh.info",
      "strict_min_version": "48.0"
    }
  },
  "manifest_version": 2,
  "name": "Simple Window Resizer",
  "version": "2.0",
  "default_locale": "en",
  "description": "__MSG_extensionDescription__",
  "icons": {
    "32": "icon_32.png",
    "48": "icon_48.png"
  },
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "32": "icon_32.png"
    },
    "default_title": "Resize!"
  },
  "commands": {
    "preset1": {
      "suggested_key": {
        "default": "Alt+1"
      },
      "description": "__MSG_preset1__"
    },
    "preset2": {
      "suggested_key": {
        "default": "Alt+2"
      },
      "description": "__MSG_preset2__"
    },
    "preset3": {
      "suggested_key": {
        "default": "Alt+3"
      },
      "description": "__MSG_preset3__"
    },
    "preset4": {
      "suggested_key": {
        "default": "Alt+4"
      },
      "description": "__MSG_preset4__"
    },
    "preset5": {
      "suggested_key": {
        "default": "Alt+5"
      },
      "description": "__MSG_preset5__"
    }
  },
  "options_ui": {
    "page": "options.html"
  }
}