Examine source code of Tab Sink

{
  "manifest_version": 2,
  "name": "Tab-sink",
  "description": "Extension to work with tabs",
  "version": "0.3.2",
  "icons": {
    "32": "static/logo.svg"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "static/logo.svg",
    "default_title": "Sink all tabs",
    "theme_icons": [
      {
        "light": "static/logo_light.svg",
        "dark": "static/logo_dark.svg",
        "size": 32
      }
    ]
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs",
    "downloads",
    "history",
    "<all_urls>"
  ]
}