Examine source code of McShort Link!

{
  "manifest_version": 2,
  "name": "McShort Link!",
  "version": "1.0.1",
  "description": "Shorten your current link. Perfect for sharing.",
  "homepage_url": "https://mcshort.link",
  "icons": {
    "48": "icons/favicon-48x48.png",
    "96": "icons/favicon-96x96.png"
  },
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/favicon-16x16.png",
      "32": "icons/favicon-32x32.png"
    },
    "default_title": "Shorten this link!",
    "default_popup": "popup/shorten.html",
    "browser_style": true
  }
}