Examine source code of PDF to File

{
  "name": "PDF to File",
  "description": "Convert PDF to files.",
  "version": "3.0",
  "icons": {
    "16": "images/16x16.png",
    "48": "images/48x48.png",
    "128": "images/128x128.png"
  },
  "homepage_url": "https://app-ptf.web.app/",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "PDF to File"
  },
  "manifest_version": 2
}