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MasteryConnect LockDown Browser

Chrome extension by Respondus Inc · Productivity · Workflow

A Chrome extension in Productivity · Workflow with 1 000 000 users, one of the largest listings in the store.

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
1 000 000 (the store no longer states an audience; this is the last figure it published)
Rating
1.5 (40 ratings)
Users, last 17 days
unchanged
Rating, last 30 days
Not watched long enough to say
Version
0.4.85
Updated in the store
2026-06-24
Published
2023-02-21
Manifest
V3
Browser access
16 permissions, 3 site patterns

How it has moved

Users
unchanged since 31.08
1M · 5 readings
  1. 2026-08-311M
  2. 2026-09-041M
  3. 2026-09-101M
  4. 2026-09-131M
  5. 2026-09-161M
Rating
+0.023 since 31.08
reviewsrating 1.452-1.475 · 5 readings
  1. 2026-08-31reviews42rating1.452
  2. 2026-09-04reviews41rating1.463
  3. 2026-09-10reviews41rating1.463
  4. 2026-09-13reviews40rating1.475
  5. 2026-09-16reviews40rating1.475
Users
unchanged since 31.08
1M · 5 readings
  1. 2026-08-311M
  2. 2026-09-041M
  3. 2026-09-101M
  4. 2026-09-131M
  5. 2026-09-161M
Rating
+0.023 since 31.08
reviewsrating 1.452-1.475 · 5 readings
  1. 2026-08-31reviews42rating1.452
  2. 2026-09-04reviews41rating1.463
  3. 2026-09-10reviews41rating1.463
  4. 2026-09-13reviews40rating1.475
  5. 2026-09-16reviews40rating1.475

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.

  • Clear your browsing data browsingData
  • Read what you have copied clipboardRead
  • Read and change cookies on the sites it can access cookies
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

What changed recently

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

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 3 users ★ 5.0
  2. ExamLock Describes nearly the same job, smaller audience 14 users
  3. Examlock lite Describes nearly the same job, with an established audience 20k users ★ 4.6
  4. eDoctrina Locker Describes nearly the same job, with a large installed audience 100k users (last published figure) ★ 2.1
  5. GDG Exam Proctor Describes a similar job, smaller audience 53 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.

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.