Who should use YouTube Thumbnail Viewer?

YouTube Thumbnail Viewer is an open-source project built for youTube viewers and content creators.

Is YouTube Thumbnail Viewer free?

Yes — YouTube Thumbnail Viewer is open source under the Open Source license and free to use.

What platforms does YouTube Thumbnail Viewer run on?

YouTube Thumbnail Viewer runs on the web, embeddable surfaces, macOS, Windows, and Linux.

Is YouTube Thumbnail Viewer still active?

Unverified. YouTube Thumbnail Viewer has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to YouTube Thumbnail Viewer?

Similar projects tracked by PulseGate include YouTube Thumbnail Viewer, YouTube Thumbnail Viewer, and YouTube Thumbnail Grabber.

Who makes YouTube Thumbnail Viewer?

YouTube Thumbnail Viewer is developed by TheWaffleman.

How long has YouTube Thumbnail Viewer been around?

YouTube Thumbnail Viewer first shipped in 2022.

Back to the index

YouTube Thumbnail Viewer

Name: YouTube Thumbnail Viewer
Author: TheWaffleman

mozilla.orgBrowser DevTools & extensions

YouTube Thumbnail Viewer is a Firefox extension that adds a button for displaying the thumbnail of the YouTube video in the current tab. It opens the thumbnail in a new browser tab and is distributed under the MIT License.

Open SourceWebEmbeddablemacOSWindowsLinux

Visit mozilla.org

3alternatives

4features

2022since

Overview

4 features

In the Browser DevTools & extensions space, YouTube Thumbnail Viewer takes a focused approach. It focuses on viewing and inspecting the thumbnail image for the YouTube video currently open in a browser tab. YouTube Thumbnail Viewer is an open-source project aimed at youTube viewers and content creators. The project is open source (Open Source). YouTube Thumbnail Viewer is available on the web, embeddable surfaces, macOS, Windows, and Linux.

Behind YouTube Thumbnail Viewer is TheWaffleman, and it first shipped in 2022. Key capabilities include thumbnail display, current tab detection, and new tab preview. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

Thumbnail display
Current tab detection
New tab preview
Browser toolbar button

Built with & integrations

Runs on

BrowserEmbeddablemacOSWindowsLinux

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of Service Open SourceFree tierGitHubMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed14 Sep · 18:53 UTC
YTthumbnailViewer verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about YouTube Thumbnail Viewer

What is YouTube Thumbnail Viewer?: YouTube Thumbnail Viewer focuses on viewing and inspecting the thumbnail image for the YouTube video currently open in a browser tab. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use YouTube Thumbnail Viewer?: YouTube Thumbnail Viewer is an open-source project built for youTube viewers and content creators.
Is YouTube Thumbnail Viewer free?: Yes — YouTube Thumbnail Viewer is open source under the Open Source license and free to use.
What platforms does YouTube Thumbnail Viewer run on?: YouTube Thumbnail Viewer runs on the web, embeddable surfaces, macOS, Windows, and Linux.
Is YouTube Thumbnail Viewer still active?: Unverified. YouTube Thumbnail Viewer has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to YouTube Thumbnail Viewer?: Similar projects tracked by PulseGate include YouTube Thumbnail Viewer, YouTube Thumbnail Viewer, and YouTube Thumbnail Grabber.YouTube Thumbnail Viewer YouTube Thumbnail Viewer YouTube Thumbnail Grabber
Who makes YouTube Thumbnail Viewer?: YouTube Thumbnail Viewer is developed by TheWaffleman.
How long has YouTube Thumbnail Viewer been around?: YouTube Thumbnail Viewer first shipped in 2022.

At a glance

Pricing: Open Source
Platforms: Web
Open source: Yes (GitHub)
License: Open Source
Built for: YouTube viewers and content creators
Model: Open source
Solves: Viewing and inspecting the thumbnail image for the YouTube video currently open in a browser tab.

Registered as

GitHub: TheWaffleman/Thumbnail-Viewer
Firefox Add-ons: ytthumbnailviewer

Developer

TheWaffleman

GitHub

Open source

View on GitHub

Index record

Indexed: 14 Sep 2026
Lifecycle: Alive
Last seen: 14 Sep 2026

Identity audit (13)

Slug: ytthumbnailviewer-mozilla-org
Lifecycle state recorded: 14 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 14 Sept 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 14 Sept 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/ytthumbnailviewer

Ship this? Send a correction — no account, and you get a link to follow it.

Similar projects

Closest matches by what these projects do