Automatic sleeping
Choose how long an inactive tab should remain awake before it becomes eligible for sleeping.
Firefox extension · v1.0.1
Keep Firefox responsive.
Performance Manager for Firefox intelligently puts inactive tabs to sleep, helping reduce resource usage while keeping your tabs ready when you need them.
Performance Manager
Smart tab resource management
Smart Modes
Site Rules
Activity Log
What it does
More control over inactive tabs.
Designed to stay simple: protect the tabs that matter and let inactive tabs sleep automatically.
Smart memory modes
Balanced, Aggressive, Maximum Savings and Custom modes make it easy to choose your preferred behavior.
Tab manager
See awake and sleeping tabs, inspect inactivity and manually sleep or keep tabs awake.
Site rules
Keep important websites awake or give individual domains their own sleep timeout.
Activity log
See when tabs were slept, restored, skipped or affected by resource limits.
Local by design
No analytics, tracking or external servers. Settings and activity data stay in Firefox.
How it works
A simple tab lifecycle.
When a tab becomes inactive, the manager records when it was last used. Once the configured conditions are met, the eligible tab is discarded from memory. Selecting it again lets Firefox restore the page.
ACTIVE→INACTIVE→SLEEPING→RESTORED