Who should use Page Block?

Page Block is an open-source project built for firefox users who want to limit repetitive tab opening.

Yes — Page Block is open source under the Open Source license and free to use.

What platforms does Page Block run on?

Page Block runs on the web and embeddable surfaces.

Is Page Block still active?

Unverified. Page Block 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 are alternatives to Page Block?

Similar projects tracked by PulseGate include Pageblocker, Page Lock, and Issues.

Who develops Page Block?

Page Block is developed by Leon de Klerk.

When did Page Block launch?

Page Block first shipped in 2024.

Back to the index

Page Block

Name: Page Block
Author: Leon de Klerk

github.comBrowser DevTools & extensions

Firefox extensions which blocks opening a tab if it was already opened x times in an interval - leondeklerk/page-block

Open SourceWebEmbeddableCloud-managed

Visit github.com

Overview

4 features

Page Block sits in PulseGate's Browser DevTools & extensions category. It focuses on preventing repeated opening of the same browser tab within a defined time interval. It is built as an open-source project for firefox users who want to limit repetitive tab opening. The project is open source (Open Source). Page Block is available on the web and embeddable surfaces.

Behind Page Block is Leon de Klerk, and it first shipped in 2024. Key capabilities include tab opening limits, time intervals, and repeated-tab blocking.

Tab opening limits
Time intervals
Repeated-tab blocking
Firefox integration

Built with & integrations

Runs on

BrowserEmbeddableCloud-managed

Trust & compliance

License

Open Source

Verified signals

HTTPSTerms of ServiceOpen SourceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed13 Sep · 14:46 UTC
Page Block verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Page Block

What does Page Block do?: Page Block focuses on preventing repeated opening of the same browser tab within a defined time interval. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use Page Block?: Page Block is an open-source project built for firefox users who want to limit repetitive tab opening.
Is Page Block free?: Yes — Page Block is open source under the Open Source license and free to use.
What platforms does Page Block run on?: Page Block runs on the web and embeddable surfaces.
Is Page Block still active?: Unverified. Page Block 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 are alternatives to Page Block?: Similar projects tracked by PulseGate include Pageblocker, Page Lock, and Issues.Pageblocker Page Lock Issues
Who develops Page Block?: Page Block is developed by Leon de Klerk.
When did Page Block launch?: Page Block first shipped in 2024.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
Built for: Firefox users who want to limit repetitive tab opening
Model: Open source
Solves: Preventing repeated opening of the same browser tab within a defined time interval.

Registered as

Firefox Add-ons: page-block

Developer

Leon de Klerk

Index record

Indexed: 13 Sep 2026
Lifecycle: Alive
Last seen: 13 Sep 2026

Identity audit (12)

Slug: page-block-github-com
Lifecycle state recorded: 13 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 13 Sep 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Written by a language model from the project's public pages.
Category from: Assigned by a language model.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 13 Sep 2026
Canonical URL: https://github.com/leondeklerk/page-block

Ship this? Send a correction — no account, and you get a link to follow it.

Similar projects

Closest matches by what these projects do