# TST Lock

> Lock important tabs from being accidentally closed while using the Tree Style Tab addon.

Canonical page: [https://chrome-stats.com/d/tst-lock](https://chrome-stats.com/d/tst-lock)

## Overview

- **ID:** `tst-lock`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Irv66
- **Category:** tabs
- **Daily users:** 39
- **Weekly downloads:** 1
- **Rating:** 5.00 / 5 (2 ratings)
- **Version:** 1.1.7
- **Last updated:** 2022-08-02
- **First published:** 2020-06-20
- **Size:** 19 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/tst-lock/)
- **Website:** [https://github.com/irvinm/TST-Lock/issues](https://github.com/irvinm/TST-Lock/issues)

## Description

TST Lock is a Firefox add-on that provides the ability to prevent accidentally closing important tabs in Tree Style Tab. By holding 'Ctrl + Shift' and clicking on a tab, you can replace the close button with a lock graphic. The addon allows you to still close the locked tab by right-clicking and selecting 'Close Tab'.

## Rankings

- #18,027 — Overall
- #236 — import

## Permissions and access

### Permissions

- `sessions`
- `tabs`

## Safety

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

## Similar extensions and apps

- [TST Lock Tree Collapsed](https://chrome-stats.com/d/tst-lock-tree-collapsed) — 175 users, 4.20 / 5
- [TST Close Tab Tree For Macos](https://chrome-stats.com/d/tst-close-tab-tree-for-macos)
- [TST Change Close Tab Button Behavior](https://chrome-stats.com/d/tst-change-close-tab-button-be) — 88 users, 4.56 / 5
- [Tab Lock](https://chrome-stats.com/d/tab-lock) — 62 users, 5.00 / 5
- [TST Focus Preceding Tab On Close](https://chrome-stats.com/d/tst-focus-preceding-tab) — 85 users, 3.40 / 5
- [TST-MiddleClick](https://chrome-stats.com/d/tst-middleclick) — 248 users, 4.57 / 5
- [Disable Tab Close](https://chrome-stats.com/d/disable-tab-close) — 223 users, 4.20 / 5
- [Tab Lock (Ask before closing)](https://chrome-stats.com/d/tab-lock-ask-before-closing) — 46 users, 5.00 / 5
- [Lock Tab Page](https://chrome-stats.com/d/lock-tab-page) — 480 users, 4.07 / 5
- [Tabloc](https://chrome-stats.com/d/tabloc) — 739 users, 4.05 / 5
- [Page Lock](https://chrome-stats.com/d/page-lock) — 173 users, 3.25 / 5
- [TST-DisableMiddleClick](https://chrome-stats.com/d/tst-disablemiddleclick) — 10 users, 5.00 / 5

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