TST Lock

Name: TST Lock
Rating: 5 (2 reviews)
Author: Irv66

By: Irv66

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

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Install

Features & Capabilities

⚠ This addon extends and works only with Tree Style Tab.

This addon provides the ability to prevent accidentally closing a tab via the "X" for tabs in Tree Style Tab that you consider important and don't want to lose.

Holding "Ctrl + Shift" while clicking on a tab will replace the "X" with a lock graphic.
Doing this action again will remove the lock and restore the default behavior.
You can still close the tab (even with the lock displayed) by right-clicking on the tab and selecting the menu item "Close Tab".

Discussion: https://github.com/piroor/treestyletab/issues/2104

User Growth & Download Statistics

Add-on

By:

Irv66

Daily users:

39 6

Rating:

5.00

(2)

Version:

1.1.7 Last updated: 2022-08-02

Version code:

5439085

Creation date:

2020-06-20

Risk:

Permissions:

Size:

19.20KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-18

Compare stats and ranking:

Ranking

# 17,334 ▲ 1,315

Other rankings

#214 in import keyword 36 ▲ 10

For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Irv66

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/tst-lock/

Website:

https://github.com/irvinm/TST-Lock/issues

User Reviews

very useful and very simple

by fa*****, 2025-05-08

View all user reviews ›

Is TST Lock Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

TST Lock requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

TST Lock has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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