Examine source code of Throttle Tabs

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Throttle Tabs",
    "default_popup": "tabs.html",
    "default_icon": "icon-light.svg",
    "theme_icons": [
      {
        "light": "icon-dark.svg",
        "dark": "icon-light.svg",
        "size": 16
      },
      {
        "light": "icon-dark.svg",
        "dark": "icon-light.svg",
        "size": 32
      }
    ],
    "default_area": "tabstrip"
  },
  "description": "Don't let your tabs get out of control",
  "homepage_url": "https://github.com/eeejay/throttle-tabs",
  "manifest_version": 2,
  "name": "Throttle Tabs",
  "icons": {
    "48": "icon-light.svg",
    "96": "icon-light.svg"
  },
  "permissions": [
    "tabs",
    "tabHide",
    "sessions",
    "contextualIdentities",
    "cookies"
  ],
  "version": "0.2",
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+Z"
      },
      "description": "Open hidden tabs menu"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "throttle-tabs@monotonous.org",
      "strict_min_version": "75.0"
    }
  }
}