Examine source code of Quick Resize

{
  "manifest_version": 2,
  "name": "Quick Resize",
  "version": "1.1",
  "description": "Resizes and repositions browser window to a predefined geometry",
  "icons": {
    "48": "icons/resize-48.png"
  },
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/resize-32.png",
    "default_title": "Quick Resize",
    "default_popup": "popup/popup.html"
  },
  "commands": {
    "cmd_1": {},
    "cmd_2": {},
    "cmd_3": {},
    "cmd_4": {},
    "cmd_5": {},
    "cmd_6": {},
    "cmd_7": {},
    "cmd_8": {},
    "cmd_9": {},
    "cmd_10": {}
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "quick_resize@sturtz.org"
    }
  }
}