PrevYou is an open-source project built for youTubers and video creators.

Does PrevYou have a free plan?

Yes — PrevYou is open source under the Open Source license and free to use.

What platforms does PrevYou run on?

PrevYou runs on the web and embeddable surfaces.

Is PrevYou still maintained?

Unverified. PrevYou 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 PrevYou?

Similar projects tracked by PulseGate include YT Thumbnail Preview, YouTube Thumbnail Tester, and YouTube Thumbnail Viewer.

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PrevYou

Name: PrevYou
Author: Val

mozilla.orgOther creative

PrevYou is an open-source Firefox extension for previewing a YouTube video's thumbnail and title in a simulated home page or subscription feed. It supports randomized placement, dark mode, saved submissions, and local use without requiring YouTube credentials.

Open SourceWebEmbeddable

Visit mozilla.org

Overview

7 features

PrevYou is an Other creative project. It focuses on previewing how a YouTube thumbnail and title will look in a home or subscription feed before publishing. It is built as an open-source project for youTubers and video creators. The project is open source (Open Source). It runs on the web and embeddable surfaces.

It is developed by Val, and it first shipped in 2021. Key capabilities include thumbnail upload, title preview, and feed simulation. 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 upload
Title preview
Feed simulation
Random placement
Dark mode
Saved submissions
No login required

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of ServiceOpen SourceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed12 Sep · 17:53 UTC
PrevYou — YouTube Thumbnail Previewer verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about PrevYou

What is PrevYou?: PrevYou focuses on previewing how a YouTube thumbnail and title will look in a home or subscription feed before publishing. It is catalogued under Other creative on PulseGate.
Who is PrevYou for?: PrevYou is an open-source project built for youTubers and video creators.
Does PrevYou have a free plan?: Yes — PrevYou is open source under the Open Source license and free to use.
What platforms does PrevYou run on?: PrevYou runs on the web and embeddable surfaces.
Is PrevYou still maintained?: Unverified. PrevYou 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 PrevYou?: Similar projects tracked by PulseGate include YT Thumbnail Preview, YouTube Thumbnail Tester, and YouTube Thumbnail Viewer.YT Thumbnail Preview YouTube Thumbnail Tester YouTube Thumbnail Viewer
Who makes PrevYou?: PrevYou is developed by Val.
How long has PrevYou been around?: PrevYou first shipped in 2021.

At a glance

Pricing: Open Source
Platforms: Web
License: Open Source
First seen: 12 Sep 2026
Built for: YouTubers and video creators
Model: Open source
Solves: Previewing how a YouTube thumbnail and title will look in a home or subscription feed before publishing.

Registered as

Firefox Add-ons: prevyou

Developer

Val

Index record

Indexed: 12 Sep 2026
Lifecycle: Alive
First seen: Sep 2026
Last seen: 12 Sep 2026

Identity audit (13)

Slug: prevyou-youtube-thumbnail-previewer-mozilla-org
Lifecycle state recorded: 12 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 12 Sep 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
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: 12 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/prevyou

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