# Performance Manager for Firefox

> Keep Firefox responsive by intelligently sleeping inactive tabs, reducing memory usage and improving browsing performance.

Canonical page: [https://chrome-stats.com/d/performance-manager-fx](https://chrome-stats.com/d/performance-manager-fx)

## Overview

- **ID:** `performance-manager-fx`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Mihai Lungu
- **Category:** tabs
- **Daily users:** 1
- **Weekly downloads:** 2
- **Version:** 1.0.1
- **Last updated:** 2026-09-09
- **First published:** 2026-09-06
- **Size:** 41 KB
- **Data as of:** 2026-09-20
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/performance-manager-fx/)
- **Website:** [https://lungumihai03.github.io/performance-manager-for-firefox/](https://lungumihai03.github.io/performance-manager-for-firefox/)

## Description

Performance Manager for Firefox helps keep Firefox responsive by intelligently sleeping inactive tabs.

Key features:
• Automatically sleep inactive tabs after a configurable period
• Smart memory modes: Balanced, Aggressive, Maximum Savings and Custom
• Maximum awake-tab limit to reduce resource usage
• Quick actions to free memory by sleeping inactive tabs
• Activity Log showing tabs that were put to sleep, restored or skipped
• Tab Performance Manager for monitoring and manually managing tabs
• Per-site rules with custom sleep times or Always Awake protection
• Protection for active, pinned, audible, loading and private tabs
• No analytics, tracking or external servers — processing happens locally in Firefox

The extension does not directly limit Firefox's total RAM usage. Instead, it reduces resource usage by unloading eligible inactive tab content from memory.

## Rankings

- #120,681 — Overall
- #33 — performance

## Permissions and access

### Permissions

- `tabs`
- `alarms`
- `storage`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High 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).

## Similar extensions and apps

- [Memory Saver Hero](https://chrome-stats.com/d/memory-saver-hero) — 22 users
- [Smart Tab Hibernator](https://chrome-stats.com/d/smart-tab-hibernator-pro) — 6 users
- [Tab Memory Monitor](https://chrome-stats.com/d/tab-memory-monitor) — 1 users
- [RamRatio](https://chrome-stats.com/d/ramratio) — 19 users
- [Auto Tab Suspender](https://chrome-stats.com/d/auto-tab-suspender) — 8 users, 3.00 / 5
- [SleepyTabs - Tab Suspender & Manager](https://chrome-stats.com/d/sleepy-tabs) — 2,165 users, 4.78 / 5
- [Tab Hibernation Engine Express](https://chrome-stats.com/d/engine-express) — 3 users
- [Memory Optimizer](https://chrome-stats.com/d/memory-optimizer) — 1,413 users, 5.00 / 5
- [Memory Purge Companion Lite](https://chrome-stats.com/d/memory-purge-companion-lite) — 1 users
- [Tab Suspender Mini](https://chrome-stats.com/d/tab-suspender-mini) — 84 users, 4.08 / 5
- [Tab Hibernation Engine Standard](https://chrome-stats.com/d/tab-hibernation-engine) — 1 users
- [Inactive Tab Manager](https://chrome-stats.com/d/inactive-tab-manager) — 1 users

---

Source: [Chrome-Stats](https://chrome-stats.com/d/performance-manager-fx)