TST Lock focuses on preventing accidental closure of tabs in Firefox's Tree Style Tab. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use TST Lock?

TST Lock is an open-source project built for firefox users who use Tree Style Tab.

Does TST Lock have a free plan?

Yes — TST Lock is open source under the Open Source license and free to use.

What platforms does TST Lock run on?

TST Lock runs on the web and embeddable surfaces.

Is TST Lock still maintained?

Unverified. TST Lock has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to TST Lock?

Similar projects tracked by PulseGate include TST Lock Tree Collapsed, TST Change Close Tab Button Behavior, and Tab Lock.

Who develops TST Lock?

TST Lock is developed by irvinm.

When did TST Lock launch?

TST Lock first shipped in 2020.

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TST Lock

Name: TST Lock
Author: irvinm

github.comBrowser DevTools & extensions

TST Lock is an open-source Firefox extension for Tree Style Tab that replaces the tab close button with a lock control. Users can toggle tab protection with Ctrl + Shift + left-click to reduce accidental tab closures.

Open SourceWebEmbeddable

Visit github.com

Overview

4 features

TST Lock is a Browser DevTools & extensions project. It focuses on preventing accidental closure of tabs in Firefox's Tree Style Tab. TST Lock is an open-source project aimed at firefox users who use Tree Style Tab. TST Lock is open source under the Open Source license. It ships for the web and embeddable surfaces.

Behind TST Lock is irvinm, and it first shipped in 2020. Key capabilities include tab locking, close-button replacement, and keyboard shortcut.

Summary written by a language model from the project’s public pages.

Tab locking
Close-button replacement
Keyboard shortcut
Tree Style Tab support

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of ServiceOpen SourceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed14 Sep · 05:19 UTC
TST Lock verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about TST Lock

What is TST Lock?: TST Lock focuses on preventing accidental closure of tabs in Firefox's Tree Style Tab. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use TST Lock?: TST Lock is an open-source project built for firefox users who use Tree Style Tab.
Does TST Lock have a free plan?: Yes — TST Lock is open source under the Open Source license and free to use.
What platforms does TST Lock run on?: TST Lock runs on the web and embeddable surfaces.
Is TST Lock still maintained?: Unverified. TST Lock has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to TST Lock?: Similar projects tracked by PulseGate include TST Lock Tree Collapsed, TST Change Close Tab Button Behavior, and Tab Lock.TST Lock Tree Collapsed TST Change Close Tab Button Behavior Tab Lock
Who develops TST Lock?: TST Lock is developed by irvinm.
When did TST Lock launch?: TST Lock first shipped in 2020.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
First seen: 14 Sep 2026
Built for: Firefox users who use Tree Style Tab
Model: Open source
Solves: Preventing accidental closure of tabs in Firefox's Tree Style Tab.

Registered as

Firefox Add-ons: tst-lock

Developer

irvinm

Index record

Indexed: 14 Sep 2026
Lifecycle: Alive
First seen: Sep 2026
Last seen: 14 Sep 2026

Identity audit (13)

Slug: tst-lock-github-com
Lifecycle state recorded: 14 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 14 Sep 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Written by a language model from the project's public pages.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 14 Sep 2026
Canonical URL: https://github.com/irvinm/TST-Lock

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