Examine source code of Archive.org linker

{
  "manifest_version": 2,
  "name": "Archive.org linker",
  "version": "0.1.0",
  "description": "Convert links to archive.org links",
  "homepage_url": "https://github.com/buckley-w-david/archiveorg-linker",
  "icons": {
    "48": "icons/filling-cabinet.svg",
    "96": "icons/filling-cabinet.svg"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/filling-cabinet.svg",
    "default_title": "Archivify"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}