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Chrome extension by chess99 · Productivity · Education

A Chrome extension in Productivity · Education with 39 users, barely installed. Audience over the last 30 days: +2.

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
39
Rating
not rated yet
Users, last 30 days
+2
Version
1.0.0
Updated in the store
2026-08-28
Published
2019-08-23
Manifest
V3
Browser access
3 permissions

How it has moved

Users
+2 since 04.10
29-39 · 16 readings
  1. 2026-10-0529
  2. 2026-10-0831
  3. 2026-10-0932
  4. 2026-10-1133
  5. 2026-10-1331
  6. 2026-10-1633
  7. 2026-10-1736
  8. 2026-10-1937
  9. 2026-10-2038
  10. 2026-10-2236
  11. 2026-10-2334
  12. 2026-10-2537
  13. 2026-10-2938
  14. 2026-10-3039
  15. 2026-11-0139
  16. 2026-11-0339
Users
+18 since 01.09
21-39 · 28 readings
  1. 2026-09-0121
  2. 2026-09-0225
  3. 2026-09-0428
  4. 2026-09-0732
  5. 2026-09-0831
  6. 2026-09-1334
  7. 2026-09-1536
  8. 2026-09-2034
  9. 2026-09-2132
  10. 2026-09-2533
  11. 2026-09-2635
  12. 2026-09-2837
  13. 2026-10-0529
  14. 2026-10-0831
  15. 2026-10-0932
  16. 2026-10-1133
  17. 2026-10-1331
  18. 2026-10-1633
  19. 2026-10-1736
  20. 2026-10-1937
  21. 2026-10-2038
  22. 2026-10-2236
  23. 2026-10-2334
  24. 2026-10-2537
  25. 2026-10-2938
  26. 2026-10-3039
  27. 2026-11-0139
  28. 2026-11-0339

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

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

  • Run its own code on the pages it can access scripting
  • Act on the current tab, but only after you click it activeTab
  • 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

chess99 publishes 2 listings we track, 66 users between them.

  1. Tab Out · by Cearl chess99 · Productivity · Tools · published 2026-05-05 27 users ★ 5.0

Like this one

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

  1. Mask Everything - Subtitle Describes nearly the same job, smaller audience 71 users ★ 4.7
  2. Page Mask|页面遮罩 Describes nearly the same job, smaller audience 19 users
  3. Subtitle Masker Describes nearly the same job, smaller audience 1k users ★ 4.6
  4. 三分熟遮罩|b站字幕遮罩工具 Describes nearly the same job, smaller audience 3 users (last published figure)
  5. 字幕遮挡器 Describes nearly the same job, smaller audience 9 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/epdjagabjcjgohepebikdkcdpfoennec/badge.svg)](https://extops.dev/extensions/epdjagabjcjgohepebikdkcdpfoennec)

HTML

<a href="https://extops.dev/extensions/epdjagabjcjgohepebikdkcdpfoennec"><img src="https://extops.dev/extensions/epdjagabjcjgohepebikdkcdpfoennec/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 2026-11-01. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built