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Library Sniffer

Chrome extension by justjavac · Productivity · Developer

  • Established publisher

A Chrome extension in Productivity · Developer with 10 000 users, an established extension.

Every site you visit. This extension can read and change the content of any page you open.

What the developer says, and 1 screenshot

Loading from the Chrome Web Store. Open the listing if it does not appear.

Users
10 000
Rating
4.3 (95 ratings)
Users, last 16 days
+2k
Rating, last 30 days
Not watched long enough to say
Version
3.0.0
Updated in the store
2026-09-02
Published
2014-10-30
Manifest
V3
Browser access
2 permissions, 2 site patterns

How it has moved

Users
+2k since 03.09
8k-10k · 3 readings
2026-09-03: appeared in the store2026-09-17: gained the good publisher record badge
  1. 2026-09-038kappeared in the store
  2. 2026-09-0410k
  3. 2026-09-1810k
Rating
unchanged since 03.09
reviewsrating 4.26 · 3 readings
2026-09-03: appeared in the store2026-09-17: gained the good publisher record badge
  1. 2026-09-03reviews95rating4.26appeared in the store
  2. 2026-09-04reviews95rating4.26
  3. 2026-09-18reviews95rating4.26
Users
+2k since 03.09
8k-10k · 3 readings
2026-09-03: appeared in the store2026-09-17: gained the good publisher record badge
  1. 2026-09-038kappeared in the store
  2. 2026-09-0410k
  3. 2026-09-1810k
Rating
unchanged since 03.09
reviewsrating 4.26 · 3 readings
2026-09-03: appeared in the store2026-09-17: gained the good publisher record badge
  1. 2026-09-03reviews95rating4.26appeared in the store
  2. 2026-09-04reviews95rating4.26
  3. 2026-09-18reviews95rating4.26

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing more than once a day and record a point only when something moves. History beyond ninety days is in the app.

What it can reach

Every site you visit. This extension can read and change the content of any page you open.

  • See the address and title of every tab you have open tabs
  • Watch the network requests your browser makes webRequest

The full permission history for this extension

What changed recently

  1. Store badges changed
  2. Appeared in the store

The publisher

justjavac publishes 2 listings we track, 30k users between them. Listed website: justjavac.com.

  1. Replace Google CDN justjavac · Make Chrome Yours · Accessibility · published 2014-11-03 20k users ★ 4.5

Like this one

Listings the catalog judges closest in what they say they do.

  1. Library Detector (Academic Tool) Describes nearly the same job, smaller audience 392 users ★ 4.6
  2. JS Library Detector Describes nearly the same job, smaller audience 568 users
  3. Library Detector Describes nearly the same job, smaller audience 9k users ★ 3.9
  4. WhatTheStack Describes nearly the same job, smaller audience 36 users ★ 5.0
  5. NoWorries Describes nearly the same job, smaller audience 5 users ★ 5.0

The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.

Is this your extension?

Connect it to Ext Ops Panel and see installs, uninstalls and uninstall reasons as events arrive, not as a weekly summary.

See what the panel does

Figures come from our own daily pass over the public Chrome Web Store listing, last read on . We publish no contact details for extension developers.