# SleepyTabs - Tab Suspender & Manager

> SleepyTabs is a browser extension that helps you manage browser tabs by automatically putting inactive tabs to sleep to save memory and improve browser performance.

Canonical page: [https://chrome-stats.com/d/sleepy-tabs](https://chrome-stats.com/d/sleepy-tabs)

## Overview

- **ID:** `sleepy-tabs`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Sato
- **Category:** tabs
- **Daily users:** 2,046
- **Weekly downloads:** 129
- **Rating:** 4.65 / 5 (23 ratings)
- **Version:** 1.10.0
- **Last updated:** 2026-08-15
- **First published:** 2025-05-27
- **Size:** 258 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/sleepy-tabs/)
- **Website:** [https://gitlab.com/satoru8/sleepytabs/-/issues](https://gitlab.com/satoru8/sleepytabs/-/issues)

## Description

SleepyTabs automatically suspends inactive tabs to save memory and boost browser performance. It uses the browser's tabs.discard API to unload tabs efficiently while keeping data local to your device. 

Key features include automatic tab sleeping, intuitive controls, 10+ themes and wallpapers, a Caffeine List to prevent sites from sleeping, granular configuration, privacy-first operation, cross-browser synchronization, and easy import/export of settings. It also supports pinned, grouped, private, and reader-mode tabs, plus keyboard shortcuts for quick management.

## Rankings

- #2,127 — Overall
- #177 — Tabs
- #7 — spend
- #28 — wa sender
- #35 — restore tabs
- #37 — new tabs

## Permissions and access

### Permissions

- `tabs`
- `storage`
- `alarms`
- `contextMenus`
- `notifications`
- `sessions`
- `tabGroups`
- `downloads`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

The add-on is praised for active development, rich feature set, and strong performance (notably RAM savings) and serves well as a Marvelous Suspender replacement. Users highlight a polished UI and useful features like a sidebar and settings sync. However, reliability issues with waking/restoring tabs and occasional tab-state losses exist, along with UX gaps such as manual exclude list entry and non-actionable URLs for reopened discarded tabs.

### Pros

- Active development and responsive developer support.
- Feature-rich with extensive customization options.
- Notable RAM savings and performance improvements.
- Effective replacement for The Marvelous Suspender with strong functionality.
- Easy-to-use interface with solid integration (sidebar, settings sync).

### Cons

- Wake/restoration can be unstable: tabs may reposition or fail to restore after sleep.
- Occasional loss of tab state or 'close tab' errors when waking/discovering pages.
- Discarded tabs after the timer expires can be hard to reopen due to non-actionable URLs.
- Exclude list management is manual; no quick-add button to whitelist sites.

## Similar extensions and apps

- [Lazy Tabs (Tab Suspender)](https://chrome-stats.com/d/lazy-tabs-tab-suspender) — 3 users, 5.00 / 5
- [Smart Tab Suspender](https://chrome-stats.com/d/smart-tabsuspender) — 40 users, 4.40 / 5
- [TabNap - Smart Tab Suspension](https://chrome-stats.com/d/tabnap) — 6 users, 5.00 / 5
- [Slumber](https://chrome-stats.com/d/slumber-tabs) — 22 users, 5.00 / 5
- [Tab Suspender Mini](https://chrome-stats.com/d/tab-suspender-mini) — 83 users, 4.45 / 5
- [Hibernating Tabs](https://chrome-stats.com/d/hibernating-tabs) — 62 users
- [tabsleeper](https://chrome-stats.com/d/tabsleeper) — 187 users, 2.56 / 5
- [Smart Tab Hibernator](https://chrome-stats.com/d/smart-tab-hibernator-pro) — 3 users
- [Auto Tab Suspender](https://chrome-stats.com/d/auto-tab-suspender) — 8 users, 3.00 / 5
- [Great Suspender resources](https://chrome-stats.com/d/great-suspender-resources) — 27 users
- [TabFrost – Memory Saver](https://chrome-stats.com/d/tabfrost) — 4 users
- [Smart Tab Suspender](https://chrome-stats.com/d/smart_tab_suspender) — 2 users

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Source: [Chrome-Stats](https://chrome-stats.com/d/sleepy-tabs)