Examine source code of QuickShot

{
  "manifest_version": 2,
  "name": "QuickShot",
  "version": "1.0",
  "description": "Take a screenshot of the current page.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "64": "icon64.png",
      "128": "icon128.png"
    }
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{11edfba4-19e4-4746-bd07-271cd62b6cb1}",
      "strict_min_version": "108.0"
    }
  }
}