Examine source code of Window Resizer

{
  "manifest_version": 2,
  "name": "Window Resizer",
  "description": "Resize the browser window.",
  "version": "1.5",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "options_page": "options.html",
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "open_in_tab": true
  },
  "browser_action": {
    "default_icon": "icons/icon-128.png",
    "default_popup": "popup.html"
  }
}