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Youtube Thumbnail Tester

Chrome extension by 99rabbits.com · Productivity · Tools

A Chrome extension in Productivity · Tools with 75 users, barely installed.

Specific sites only: 1 match pattern.

What the developer says, and 1 screenshot

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

Users
75
Rating
5.0 (1 ratings)
Users, last 15 days
-5
Rating, last 30 days
Not watched long enough to say
Version
1.0.0
Updated in the store
2026-02-16
Published
2026-02-16
Manifest
V3
Browser access
4 permissions, 1 site pattern

How it has moved

Users
-5 since 31.08
75-81 · 7 readings
  1. 2026-08-3180
  2. 2026-09-0281
  3. 2026-09-0480
  4. 2026-09-0779
  5. 2026-09-0880
  6. 2026-09-0975
  7. 2026-09-1475
Rating
unchanged since 31.08
reviewsrating 5.00 · 7 readings
  1. 2026-08-31reviews1rating5.00
  2. 2026-09-02reviews1rating5.00
  3. 2026-09-04reviews1rating5.00
  4. 2026-09-07reviews1rating5.00
  5. 2026-09-08reviews1rating5.00
  6. 2026-09-09reviews1rating5.00
  7. 2026-09-14reviews1rating5.00
Users
-5 since 31.08
75-81 · 7 readings
  1. 2026-08-3180
  2. 2026-09-0281
  3. 2026-09-0480
  4. 2026-09-0779
  5. 2026-09-0880
  6. 2026-09-0975
  7. 2026-09-1475
Rating
unchanged since 31.08
reviewsrating 5.00 · 7 readings
  1. 2026-08-31reviews1rating5.00
  2. 2026-09-02reviews1rating5.00
  3. 2026-09-04reviews1rating5.00
  4. 2026-09-07reviews1rating5.00
  5. 2026-09-08reviews1rating5.00
  6. 2026-09-09reviews1rating5.00
  7. 2026-09-14reviews1rating5.00

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

Specific sites only: 1 match pattern.

  • https://*.youtube.com/*
  • 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
Show the remaining 1
  • Store data in your browser without the usual size limit unlimitedStorage

The full permission history for this extension

What changed recently

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

The publisher

99rabbits.com publishes 2 listings we track, 238 users between them.

  1. Markdown Copier 99rabbits.com · Productivity · Workflow · published 2023-04-03 163 users ★ 5.0

Like this one

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

  1. Thumblr - YouTube Thumbnail Preview Describes nearly the same job, smaller audience 12 users
  2. YouThumb: YouTube Thumbnail Tester & Generator Describes nearly the same job, smaller audience 129 users ★ 5.0
  3. ThumbCraft – YouTube Thumbnail Previewer Describes nearly the same job, smaller audience 5 users
  4. Pro Thumbnail Preview for YouTube Describes nearly the same job, smaller audience 72 users ★ 5.0
  5. Thumbnail Preview - YouTube Thumbnail Testing Describes nearly the same job, smaller audience 891 users ★ 4.9

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.