404 Bookmarks

Name: 404 Bookmarks
Rating: 3.8957 (115 reviews)
Author: Tom Schuster

With this extension you can find expired bookmarks and remove them easily. You can find all kinds of broken bookmarks, like pages that return 404 (Page not found) or other HTTP errors.

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Features & Capabilities

404 Bookmarks Chrome Extension

The 404 Bookmarks extension helps users manage and clean their bookmarks by detecting expired and broken links. It scans bookmarks to identify those leading to pages returning HTTP 404 errors (Page Not Found) or other HTTP errors such as 403 (Forbidden), 503 (Service Unavailable), or DNS lookup failures.

Users can quickly find and remove expired bookmarks, keeping their bookmark collections up-to-date and clutter-free. The extension warns users to manually verify links before deleting, as deletions cannot be undone. For best functionality, users should temporarily disable ad blockers like uBlock or Adblock Plus if websites are incorrectly shown as broken.

This extension provides an efficient way to maintain bookmark quality, improve browsing experience, and avoid frustration caused by broken links.

User Growth & Download Statistics

Add-on

By:

Daily users:

Rating:

Version:

1.8resigned1 Last updated: 2024-04-25

Version code:

5727599

Creation date:

2017-02-03

Risk:

Permissions:

bookmarks
<all_urls>

Size:

19.07KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-19

Compare stats and ranking:

Ranking

# 1,982 ▲ 10

Other rankings

#62 in Bookmarks ▲ 1

#325 in Other extensions

#6 in bookmarks keyword 36

#8 in bookmark keyword 32

#28 in error keyword 16 ▲ 2

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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:

Tom Schuster

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/404-bookmarks/

Website:

https://github.com/evilpie/404-bookmarks/

User Reviews

Users praise 404 Bookmarks for reliably finding many dead links, simplicity, and ability to handle large bookmark sets for cleanup. Repeated complaints are lack of a visible UI/instructions, no pause/stop or filtering options, minimal output (no URL/path/export), and resource/performance impact during long scans.

Pros

Effectively finds and lists dead/404 bookmarks (many users found large numbers of expired links)
Works on large bookmark collections (users reported scanning thousands to tens of thousands)
Very simple/minimal to use — many called it easy and quick to run
Useful for periodic cleanup (including use on TorBrowser)

Cons

No clear user interface or instructions — several users couldn't find how to run it or where controls are
No processing controls (no pause/stop), and no filters or settings to refine scans
Very bare‑bones output — missing features such as showing bookmark URL/path, export (CSV), or additional search options
Can consume noticeable resources and slow Firefox during large scans

Recent reviews

by ak*****, 2026-04-30

I have been collecting bookmarks for 5 years, and this is a wonderful extension to have. Over 3000 expired (404) bookmarks.

by Su*****, 2025-08-16

There is no stop function when searching through bookmarks, and you always have to scroll down to select them. This may be fine with a few hundred bookmarks, but with thousands of bookmarks it's annoying. You have to wait forever for the list to be processed. And Firefox's performance drops dramatically during this time. With a stop button, you could pause the search to sort through the results. But then the select button has to be at the top, because it always moves with the bookmarks found. Terrible!

by dj*****, 2025-06-18

View all user reviews ›

Is 404 Bookmarks 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.

404 Bookmarks requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
Medium ****** ** ********* *** ******* ******** **** **** *********** *** ********* *** ********* ******* *** *****

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.

404 Bookmarks 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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