Examine source code of Pinned Notion.so

{
  "manifest_version": 2,
  "name": "Pinned Notion.so",
  "version": "1.2",
  "description": "Opens Notion.so in New Pinned Tab",
  "background": {
    "scripts": [
      "pinnednotiontab.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/16px-notionicon.png",
      "32": "icons/32px-notionicon.png"
    }
  }
}