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MasteryConnect LockDown Browser

Chrome extension by Respondus Inc · Productivity · Workflow

A Chrome extension in Productivity · Workflow with 2 000 000 users, one of the largest listings in the store. Audience over the last 30 days: +1 000 000.

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
2 000 000
Rating
1.5 (44 ratings)
Users, last 30 days
+1 000 000 (the store rounds this count to 1 000 000, so it moves only between steps)
Rating, last 30 days
+0.08 in 30 days
Version
0.4.91
Updated in the store
2026-09-23
Published
2023-02-21
Manifest
V3
Browser access
16 permissions, 3 site patterns

How it has moved

Users
+1M since 13.10
1M-2M · 5 readings
  1. 2026-10-162M
  2. 2026-10-181M
  3. 2026-10-212M
  4. 2026-10-232M
  5. 2026-11-122M
Rating
+0.08 since 13.10
reviewsrating 1.47-1.54 · 5 readings
  1. 2026-10-16reviews43rating1.47
  2. 2026-10-18reviews43rating1.47
  3. 2026-10-21reviews43rating1.47
  4. 2026-10-23reviews44rating1.54
  5. 2026-11-12reviews44rating1.54
Users
+1M since 31.08
1M-2M · 15 readings
2026-09-24: released 0.4.91
  1. 2026-08-311M
  2. 2026-09-041M
  3. 2026-09-101M
  4. 2026-09-131M
  5. 2026-09-172M
  6. 2026-09-272M
  7. 2026-10-042M
  8. 2026-10-082M
  9. 2026-10-092M
  10. 2026-10-111M
  11. 2026-10-162M
  12. 2026-10-181M
  13. 2026-10-212M
  14. 2026-10-232M
  15. 2026-11-122M
Rating
+0.09 since 31.08
reviewsrating 1.45-1.54 · 15 readings
2026-09-24: released 0.4.91
  1. 2026-08-31reviews42rating1.45
  2. 2026-09-04reviews41rating1.46
  3. 2026-09-10reviews41rating1.46
  4. 2026-09-13reviews40rating1.48
  5. 2026-09-17reviews40rating1.48
  6. 2026-09-27reviews39rating1.49
  7. 2026-10-04reviews41rating1.46
  8. 2026-10-08reviews42rating1.48
  9. 2026-10-09reviews43rating1.47
  10. 2026-10-11reviews43rating1.47
  11. 2026-10-16reviews43rating1.47
  12. 2026-10-18reviews43rating1.47
  13. 2026-10-21reviews43rating1.47
  14. 2026-10-23reviews44rating1.54
  15. 2026-11-12reviews44rating1.54

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing up to 2 times 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.

Show the remaining 13
  • Read and change your browsing history history
  • See, enable and disable your other extensions management
  • See the address and title of every tab you have open tabs
  • Watch the network requests your browser makes webRequest
  • Change what sites are allowed to do contentSettings
  • Block or redirect requests on the sites it can access declarativeNetRequestWithHostAccess
  • Run its own code on the pages it can access scripting
  • See when you navigate between pages webNavigation
  • Act on the current tab, but only after you click it activeTab
  • Put data on your clipboard clipboardWrite
  • Store data in your browser storage
  • Read your display setup system.display
  • Change your desktop wallpaper wallpaper

The full permission history for this extension

Version history

  1. Version 0.4.91

What changed recently

  1. Package size changed
  2. Released version 0.4.91 (was 0.4.85)

The publisher

Respondus Inc.

Like this one

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

  1. LockItDown Browser Describes nearly the same job, smaller audience 7 users ★ 5.0
  2. ExamLock Describes nearly the same job, smaller audience 21 users
  3. Examlock lite Describes nearly the same job, with an established audience 20k users ★ 4.7
  4. eDoctrina Locker Describes nearly the same job, with a large installed audience 100k users ★ 2.1
  5. GDG Exam Proctor Describes a similar job, smaller audience 55 users

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.

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Users and rating on Ext Ops Panel

Markdown

[![Users and rating on Ext Ops Panel](https://extops.dev/extensions/nkkighcdodpjcdenompholalclpaobff/badge.svg)](https://extops.dev/extensions/nkkighcdodpjcdenompholalclpaobff)

HTML

<a href="https://extops.dev/extensions/nkkighcdodpjcdenompholalclpaobff"><img src="https://extops.dev/extensions/nkkighcdodpjcdenompholalclpaobff/badge.svg" alt="Users and rating on Ext Ops Panel" height="20"></a>

Figures come from our own regular passes over the public Chrome Web Store listing, last read on . The store last changed these figures on 2026-10-23. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built