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Potentially Dangerous File Extension Blocker

Chrome extension by Questionably Secure · Productivity · Developer

A Chrome extension in Productivity · Developer with 1 000 users, a small but real audience.

No site access is declared in the manifest, so it cannot read the pages you open on its own.

What the developer says, and 1 screenshot

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

Users
1 000
Rating
1.0 (1 ratings)
Users, last 18 days
+917
Rating, last 30 days
Not watched long enough to say
Version
1.2.1
Updated in the store
2025-05-12
Published
2016-12-01
Manifest
V3
Browser access
3 permissions

How it has moved

Users
+917 since 31.08
80-1k · 9 readings
  1. 2026-08-3183
  2. 2026-09-0380
  3. 2026-09-04180
  4. 2026-09-05287
  5. 2026-09-07290
  6. 2026-09-09438
  7. 2026-09-13783
  8. 2026-09-161k
  9. 2026-09-171k
Rating
unchanged since 31.08
reviewsrating 1.00 · 9 readings
  1. 2026-08-31reviews1rating1.00
  2. 2026-09-03reviews1rating1.00
  3. 2026-09-04reviews1rating1.00
  4. 2026-09-05reviews1rating1.00
  5. 2026-09-07reviews1rating1.00
  6. 2026-09-09reviews1rating1.00
  7. 2026-09-13reviews1rating1.00
  8. 2026-09-16reviews1rating1.00
  9. 2026-09-17reviews1rating1.00
Users
+917 since 31.08
80-1k · 9 readings
  1. 2026-08-3183
  2. 2026-09-0380
  3. 2026-09-04180
  4. 2026-09-05287
  5. 2026-09-07290
  6. 2026-09-09438
  7. 2026-09-13783
  8. 2026-09-161k
  9. 2026-09-171k
Rating
unchanged since 31.08
reviewsrating 1.00 · 9 readings
  1. 2026-08-31reviews1rating1.00
  2. 2026-09-03reviews1rating1.00
  3. 2026-09-04reviews1rating1.00
  4. 2026-09-05reviews1rating1.00
  5. 2026-09-07reviews1rating1.00
  6. 2026-09-09reviews1rating1.00
  7. 2026-09-13reviews1rating1.00
  8. 2026-09-16reviews1rating1.00
  9. 2026-09-17reviews1rating1.00

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

No site access is declared in the manifest, so it cannot read the pages you open on its own.

  • Manage your downloads downloads
  • Show you notifications notifications
  • Store data in your browser storage

The full permission history for this extension

What changed recently

Nothing has moved on this listing since we started watching it.

The publisher

Questionably Secure publishes 3 listings we track, 102k users between them.

  1. WebRTC Leak Prevent Questionably Secure · Productivity · Developer · published 2015-06-30 100k users ★ 4.0
  2. Do Not Track (DNT) and Global Privacy Control (GPC) Enabler Questionably Secure · Productivity · Developer · published 2018-10-29 739 users ★ 5.0

Like this one

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

  1. Managed Files Describes nearly the same job, with an established audience 10k users
  2. Denied File Extensions Describes nearly the same job, smaller audience 3 users (last published figure)
  3. SafeBlock Describes nearly the same job, smaller audience 82 users
  4. Sentinelle Describes nearly the same job, smaller audience 4 users
  5. Download Blocker Describes nearly the same job, with an established audience 20k users ★ 3.6

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.