Examine source code of Open Figma app

{
  "manifest_version": 2,
  "name": "Open Figma app",
  "description": "Open Figma links in the app and close the tab after 5 seconds.",
  "version": "2.1",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.figma.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "logo-16.png",
    "48": "logo-48.png",
    "128": "logo-128.png"
  },
  "permissions": [
    "https://www.figma.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "open-figma@jan.com"
    }
  }
}