Examine source code of QuickNote

{
  "manifest_version": 2,
  "name": "QuickNote",
  "short_name": "QuickNote",
  "version": "1.0.0",
  "description": "Create quick, anonymous notes",
  "author": "https://manuel.friger.io",
  "homepage_url": "https://quicknote.io?utm_source=firefox-addon",
  "icons": {
    "16": "16.png",
    "32": "32.png",
    "96": "96.png",
    "128": "128.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_popup": "popup.html",
    "default_icon": {
      "16": "16.png",
      "32": "32.png",
      "96": "96.png",
      "128": "128.png"
    }
  }
}