Examine source code of WinSizeNPosition

{
  "manifest_version": 2,
  "name": "WinSizeNPosition",
  "version": "3.0.2resigned1",
  "author": "Susie",
  "description": "Save browser window size and position,restore ones.",
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icons/wsnp_icon_16.png",
    "32": "icons/wsnp_icon_32.png",
    "48": "icons/wsnp_icon_48.png",
    "64": "icons/wsnp_icon_64.png",
    "96": "icons/wsnp_icon_96.png",
    "128": "icons/wsnp_icon_128.png"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "WinSizeNPosition",
    "default_popup": "toolbar_menu.html",
    "default_icon": {
      "16": "icons/wsnp_icon_16.png",
      "32": "icons/wsnp_icon_32.png"
    }
  },
  "background": {
    "scripts": [
      "common.js",
      "background.js"
    ]
  },
  "commands": {
    "preset-1": {
      "suggested_key": {
        "default": "Alt+1"
      },
      "description": "Activate preset #1"
    },
    "preset-2": {
      "suggested_key": {
        "default": "Alt+2"
      },
      "description": "Activate preset #2"
    },
    "preset-3": {
      "suggested_key": {
        "default": "Alt+3"
      },
      "description": "Activate preset #3"
    },
    "preset-4": {
      "suggested_key": {
        "default": "Alt+4"
      },
      "description": "Activate preset #4"
    },
    "preset-5": {
      "suggested_key": {
        "default": "Alt+5"
      },
      "description": "Activate preset #5"
    },
    "preset-6": {
      "suggested_key": {
        "default": "Alt+6"
      },
      "description": "Activate preset #6"
    },
    "preset-7": {
      "suggested_key": {
        "default": "Alt+7"
      },
      "description": "Activate preset #7"
    },
    "preset-8": {
      "suggested_key": {
        "default": "Alt+8"
      },
      "description": "Activate preset #8"
    },
    "preset-9": {
      "suggested_key": {
        "default": "Alt+9"
      },
      "description": "Activate preset #9"
    },
    "preset-0": {
      "suggested_key": {
        "default": "Alt+0"
      },
      "description": "Activate preset #0"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fdbfc1ff-03af-4c4f-83a0-1289f416a3c1}"
    }
  }
}