What does 404 Bookmarks do?

404 Bookmarks focuses on finding and removing bookmarks that point to expired or unavailable web pages. It is catalogued under Browser DevTools & extensions on PulseGate.

Who is 404 Bookmarks for?

404 Bookmarks is an open-source project built for firefox users who maintain large bookmark collections.

What platforms does 404 Bookmarks run on?

404 Bookmarks runs on the web, embeddable surfaces, macOS, Windows, and Linux.

Is 404 Bookmarks still maintained?

Unverified. 404 Bookmarks 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 404 Bookmarks?

Similar projects tracked by PulseGate include Bookmarks clean up, Bookmarks Organizer, and Broken Bookmark Finder.

Who develops 404 Bookmarks?

404 Bookmarks is developed by evilpie.

How long has 404 Bookmarks been around?

404 Bookmarks first shipped in 2017.

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404 Bookmarks

Name: 404 Bookmarks
Author: evilpie

github.comInfrastructure

404 Bookmarks is an open-source Firefox extension that checks saved bookmarks for expired or unavailable pages. It helps users identify and remove dead links from their browser bookmark collection.

Open SourceWebEmbeddablemacOSWindowsLinux

Visit github.com

Overview

4 features

404 Bookmarks is a Browser DevTools & extensions project. It focuses on finding and removing bookmarks that point to expired or unavailable web pages. 404 Bookmarks is an open-source project aimed at firefox users who maintain large bookmark collections. 404 Bookmarks is open source under the Open Source license. It runs on the web, embeddable surfaces, macOS, Windows, and Linux.

Behind 404 Bookmarks is evilpie, and it first shipped in 2017. Among its 4 catalogued features are bookmark scanning, expired link detection, and dead link removal.

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

Bookmark scanning
Expired link detection
Dead link removal
Firefox integration

Built with & integrations

Runs on

BrowserEmbeddablemacOSWindowsLinux

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

Indexed8 Sept · 11:30 UTC
404 Bookmarks verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about 404 Bookmarks

What does 404 Bookmarks do?: 404 Bookmarks focuses on finding and removing bookmarks that point to expired or unavailable web pages. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is 404 Bookmarks for?: 404 Bookmarks is an open-source project built for firefox users who maintain large bookmark collections.
Does 404 Bookmarks have a free plan?: Yes — 404 Bookmarks is open source under the Open Source license and free to use.
What platforms does 404 Bookmarks run on?: 404 Bookmarks runs on the web, embeddable surfaces, macOS, Windows, and Linux.
Is 404 Bookmarks still maintained?: Unverified. 404 Bookmarks 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 404 Bookmarks?: Similar projects tracked by PulseGate include Bookmarks clean up, Bookmarks Organizer, and Broken Bookmark Finder.Bookmarks clean up Bookmarks Organizer Broken Bookmark Finder
Who develops 404 Bookmarks?: 404 Bookmarks is developed by evilpie.
How long has 404 Bookmarks been around?: 404 Bookmarks first shipped in 2017.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
First seen: 8 Sept 2026
Built for: Firefox users who maintain large bookmark collections
Model: Open source
Solves: Finding and removing bookmarks that point to expired or unavailable web pages.

Registered as

Firefox Add-ons: 404-bookmarks

Developer

evilpie

Index record

Indexed: 8 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 8 Sept 2026

Identity audit (13)

Slug: 404-bookmarks-github-com
Lifecycle state recorded: 8 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 8 Sept 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: 8 Sept 2026
Canonical URL: https://github.com/evilpie/404-bookmarks

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