Firefox Browser Add-ons
  • Extensions
  • Themes
    • for Firefox
    • Dictionaries & Language Packs
    • Other Browser Sites
    • Add-ons for Android
Log in
Preview of SleepyTabs - Beautiful Tab Suspender

SleepyTabs - Beautiful Tab Suspender by Sato

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.

4.8 (4 reviews)4.8 (4 reviews)
70 Users70 Users
You’ll need Firefox to use this extension
Download Firefox and get the extension
Download file

Extension Metadata

Screenshots
Popup window, main tabPopout window main tabPopout window appearance abPopout window Advanced tabStandard Sleeping PagePage with themePage with theme and wallpaper
About this extension
SleepyTabs - Browser Tab Suspender & Manager

🚀 Boost Your Browser Performance

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.

✨ Key Features
  • 🔄 Automatic Tab Sleeping - Save memory after your chosen inactivity period
  • 🎛️ Intuitive Controls - Sleep or wake tabs with simple clicks or keyboard shortcuts
  • 🎨 Beautiful Sleeping Pages - Customize with themes and wallpapers
  • ⚙️ Flexible Configuration - Tailor to your exact preferences
  • 🔒 Privacy Focused - Works entirely in your browser, no data sent externally

🛠️ Tab Management
  • Sleep tabs automatically after customizable inactivity periods
  • Whitelist important sites that should never sleep
  • Configure which tabs can sleep (pinned, audible, etc.)
  • Sync your settings across multiple browsers
  • Easily export/import your configuration

🎭 Themes

Choose from multiple designed themes:
- Dark (Default)
- Light
- Midnight
- Sepia
- Solarized
- Nord

Add beautiful wallpapers to your sleeping tabs with adjustable brightness!

⌨️ Keyboard Shortcuts
  • Put current tab to sleep: Ctrl+Shift+1
  • Sleep all tabs: Ctrl+Shift+2
  • Wake all tabs: Ctrl+Shift+3
  • Open SleepyTabs sidebar: Ctrl+Shift+4
  • Wake sleeping tabs: Enter

📥 Installation

Firefox

Chrome

🔐 Privacy First

SleepyTabs operates entirely within your browser. No data is sent to external servers, and all tab information is stored locally.

📝 Changelog

You can view the full change log here.

🤝 Contributing

Contributions welcome! Submit issues or pull requests to help improve SleepyTabs.

📜 License

SleepyTabs is licensed under the GNU Affero General Public License v3.0.
Rated 4.8 by 4 reviewers
Sign in to rate this extension
There are no ratings yet

Star rating saved

5
3
4
1
3
0
2
0
1
0
Read all 4 reviews
Permissions and dataLearn more

Required permissions:

  • Access browser tabs
More information
Add-on Links
  • Homepage
  • Support site
  • Support Email
Version
1.2.5
Size
105.66 KB
Last updated
15 hours ago (Aug 17, 2025)
Related Categories
  • Tabs
License
GNU Affero General Public License v3.0 only
Version History
  • See all versions
Add to collection
Report this add-on
Support this developer

The developer of this extension asks that you help support its continued development by making a small contribution.

Contribute now

Release notes for 1.2.5
Update time! Some code cleanup, new feature and minor bug fixes. For now the Sleeping Groups are fairly basic. Ill expand on this in coming updates. Feedback always welcome. Easiest way is to open an issue on the gitlab.

Version 1.2.5 (August 16, 2025)

New Features
  • Sleeping Tabs Groups
  • New setting in Appearance, Use Groups. If enabled, tabs will be placed into a Sleeping group.
  • Default group name and color can be set to customize the sleeping group.
  • The setting uses the Group Name to find sleep/wake tabs. If the group name is changed, newly slept tabs will use the new group.

Bug Fixes
  • Some minor UI changes.
  • 'Float on Top' restyle.
More extensions by Sato
  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

Go to Mozilla’s homepage

Add-ons

  • About
  • Firefox Add-ons Blog
  • Extension Workshop
  • Developer Hub
  • Developer Policies
  • Community Blog
  • Forum
  • Report a bug
  • Review Guide

Browsers

  • Desktop
  • Mobile
  • Enterprise

Products

  • Browsers
  • VPN
  • Relay
  • Monitor
  • Pocket
  • Bluesky (@firefox.com)
  • Instagram (Firefox)
  • YouTube (firefoxchannel)
  • Privacy
  • Cookies
  • Legal

Except where otherwise noted, content on this site is licensed under the Creative Commons Attribution Share-Alike License v3.0 or any later version.