Youtube Watch Thumbnails

Name: Youtube Watch Thumbnails
Author: mosunset

Display YouTube video thumbnails directly on the watch page. This extension automatically shows thumbnail images next to the channel icon, allows you to view all available thumbnail sizes, and provides a hover zoom feature. Click the thumbnail to

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Features & Capabilities

YouTube Watch Thumbnails

A browser extension that displays YouTube video thumbnail images directly on the watch page, making it easy to view and check all available thumbnail sizes.

Features

Automatic Thumbnail Display: Automatically displays thumbnail images next to the channel icon on YouTube watch pages
Hover Zoom: Hover over the thumbnail to see an enlarged preview (1.75x scale)
Thumbnail View Page: Click the thumbnail to open a dedicated page showing all available thumbnail resolutions (WebP and JPG formats)
Multiple Resolutions: View thumbnails in various sizes including maxresdefault, hq720, sddefault, and more
Image Size Information: See the actual dimensions (width × height) of each thumbnail image

How It Works

When you visit a YouTube video page, the extension automatically:

Detects the video ID from the URL
Displays the thumbnail image next to the channel icon
Allows you to hover to zoom or click to view all sizes

The extension works on:

Regular watch pages (/watch?v=)
YouTube Shorts pages (/shorts/)
All YouTube subdomains (www.youtube.com, m.youtube.com, etc.)

Privacy

This extension does not collect, store, or transmit any user data. All operations are performed locally in your browser. The extension only accesses YouTube pages to display thumbnail images.

Technical Details

Built with React and TypeScript
Uses WXT framework for cross-browser compatibility
No external API calls or data collection
Open source and transparent

User Growth & Download Statistics

Add-on

By:

mosunset

Daily users:

15 1

Version:

4.0.0 Last updated: 2025-11-09

Version code:

6069370

Creation date:

2025-11-06

Risk:

Permissions:

Content scripts matches:

*.youtube.com
m.youtube.com
www.youtube.com
youtube.com

Size:

183.11KB

Email:

dr*****@gmail.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-20

Compare stats and ranking:

Ranking

# 27,189 ▲ 798

Other rankings

#79 in watch keyword 23 ▲ 4

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

mosunset

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/youtube-watch-thumbnails/

Email:

dr*****@gmail.com

Website:

https://github.com/mosunset/youtube_watch_thumbnails

Is Youtube Watch Thumbnails Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Youtube Watch Thumbnails requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Youtube Watch Thumbnails is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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