Chrome Browser Lockdown icon

Chrome Browser Lockdown

by Harris Computers · Accessibility
Manifest V3 Free
View in Chrome Web Store Data as of 15 Oct 2026

Blocks students from opening new tabs when they are completing a Castle assignment.

Users
100K
+30K in 30 days
Rating
1.2 / 5
unchanged in 30 days
Ratings
12
0 in 30 days
Store rank
#2,276
#2,010 among extensions
Version
0.0.8
updated 9 Aug 2022

Users

monthly, 3 years
050K100KAug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 100,000 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 years
1612Aug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 12 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Chrome Browser Lockdown

When a teacher or admin assigns an assignment or assessment in Castle Learning, they may enable an option to Enable Browser Lockdown. If they have enabled that option AND this extension is installed on the device that the student is using to complete the assignment or assessment, it will close all other tabs and will not allow the student to open a new tab or browser window.

Growth

WindowUsersChangeRatingsRating
7 days0+0.0%00.00
30 days+30K+42.9%00.00
6 months0+0.0%00.00
1 year+100K–00.00

Version history

2 versions recorded
0.0.89 Aug 2022
0.0.617 May 2022

Details

Category
Accessibility
First seen
17 May 2022
Size
15 KB
Languages
en-US
Pricing
Free
Privacy policy
cl.castlelearning.com
Extension ID
kjafomlgjddlogahodihnhhmlobijdff

Permissions and risk

Moderate riskimpact 3, likelihood 2
Permissions
tabsnotifications

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