# Simple Firm Session Manager

> Save & restore browser sessions. Frees RAM instantly — suspends background tabs on save, not on restore. Multi-window save/restore, snapshot history rollback, tags, colors, auto-save, optional folder sync.

Canonical page: [https://chrome-stats.com/d/simple-firm-session-manager](https://chrome-stats.com/d/simple-firm-session-manager)

## Overview

- **ID:** `simple-firm-session-manager`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** kbtanvir.dev
- **Category:** privacy-security,bookmarks,tabs
- **Daily users:** 18
- **Version:** 1.0.5
- **Last updated:** 2026-05-26
- **First published:** 2026-02-25
- **Size:** 99 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/simple-firm-session-manager/)

## Description

<strong>Stop hoarding tabs. Save the session, free the memory, get on with your day.</strong>

SF Session Manager is a tab session manager built for people whose browser is
slowing down because they have too many tabs open. Unlike most session savers
that only free memory <em>after</em> you restore a session, SF Session Manager
discards the source window's background tabs <strong>the moment you save</strong> — your
RAM drops immediately, not later.

If you've used <strong>The Great Suspender</strong> (now defunct) and never found a clean
replacement, or if you've outgrown <strong>Tab Session Manager</strong>, <strong>OneTab</strong>, or
<strong>Auto Tab Discard</strong> for any reason — this is built to be the tool you
actually keep.

Why it exists

Modern browsers don't get slow from open tabs — they get slow from <em>loaded</em>
tabs. Every active tab is 30–100 MB of RAM, sometimes more. Once you cross
~50 tabs, even a 16 GB laptop starts to drag.

The fix everyone reaches for is to bookmark the tabs and close the window.
That works, but you lose multi-window context, tab groups, pinned tabs, and
the scroll position of every page. A few hours later you're hunting through
bookmarks trying to reconstruct what you had.

SF Session Manager fixes that without the bookmark dance.

What it actually does

<strong>Save = immediate memory drop.</strong> When you save a session, every non-pinned,
non-active tab in the source window is discarded on the spot. RAM usage falls
to ~5 MB per tab while the URL, title, and pinned state are preserved.

<strong>Multi-window save &amp; restore.</strong> All your open Firefox windows are saved as a
single named session. Tab groups, pinned tabs, window state (maximized /
normal), and focus order are preserved. Restore opens the windows back in the
same shape.

<strong>Restore as sleeping (toggle).</strong> By default, restored tabs come back
discarded — they only load when you click them, so opening a 200-tab session
doesn't melt your RAM. Flip the Options toggle off if you want eager loads
instead.

<strong>Snapshot history.</strong> Every time you overwrite a session from the current
window, the prior state is kept as a snapshot. Up to 10 snapshots per
session. One-click rollback if you over-save by accident.

<strong>Tags &amp; per-session colors.</strong> Mark sessions with free-form tags
(<code>#work</code>, <code>#research</code>, <code>#shopping</code>) and assign a background + foreground
color per session. The popup gets a filter chip row at the top so you can
narrow to one tag in a click.

<strong>Auto-save.</strong> Pick a target session, choose an interval (30 s / 1 min / 5
min / 15 min), and SF Session Manager periodically overwrites it from your
current window state. Each overwrite still drops a snapshot, so you can roll
back any auto-save. Great for "this is my active work session — keep it
checkpointed every minute".

<strong>Optional folder sync.</strong> On Chromium browsers, pick a local folder; on
Firefox, sync to <code>Downloads/session-manager/</code>. Each session writes as a
single JSON file plus a manifest. Reinstall the extension, re-import the
folder, all your sessions are back.

<strong>Export / import.</strong> Single-file JSON export and import. Move sessions
between profiles, between devices, or back them up to your own cloud.

Built for power users
<ul><li>Tab hoarders who actually need 100+ tabs of context but don't want the RAM bill</li><li>Researchers, writers, devs juggling several lines of work at once</li><li>Anyone who's lost work to a browser crash or accidental window close</li><li>Refugees from The Great Suspender, Tab Suspender, BarTab, or any extension
  that broke when Manifest V3 landed</li><li>Multi-monitor setups where windows mean something (left = research, right =
  writing, etc.)</li></ul>

What it doesn't do (on purpose, in v1.1)
<ul><li>No cloud sync between devices yet — coming in v2 (paid tier)</li><li>No team session sharing — coming in v2</li><li>No automatic per-domain rules — by design; you tell it what to save and when</li></ul>

Privacy

Local-only by default. Sessions live in your browser's <code>chrome.storage.local</code>.
The optional folder sync writes to a folder you pick (or <code>Downloads/</code> on
Firefox) — your computer, your files. <strong>No telemetry. No accounts. No
server.</strong> The MV3 manifest lists exactly four permissions: <code>tabs</code>,
<code>tabGroups</code>, <code>storage</code>, <code>downloads</code>, plus <code>alarms</code> for the auto-save timer.
You can audit them in Firefox's add-ons manager.

Keywords

tab session manager · save tabs · restore tabs · session backup · tab
manager · suspend tabs · discard tabs · sleep tabs · hibernate tabs · unload
tabs · freeze tabs · snooze tabs · lazy load tabs · tab unloader · tab
freezer · multi-window · tab groups · pinned tabs · workspace · workspace
switcher · tab snapshot · session snapshot · rollback · undo session · tab
backup · restore tabs after crash · firefox eating RAM · firefox slow many
tabs · save RAM · save memory · memory saver · RAM saver · speed up firefox
· battery saver · tab hoarder · 100 tabs open · Great Suspender alternative
· OneTab alternative · Tab Wrangler alternative · Tab Suspender alternative
· Auto Tab Discard alternative

## Rankings

- #25,951 — Overall
- #53 — session
- #146 — mission
- #239 — simple

## Permissions and access

### Permissions

- `tabs`
- `tabGroups`
- `storage`
- `downloads`
- `alarms`

## 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 has low user count. Unpopular extensions 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).

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Source: [Chrome-Stats](https://chrome-stats.com/d/simple-firm-session-manager)