Who should use YouTube Fullscreen Fit?

YouTube Fullscreen Fit is an open-source project built for youTube viewers using Firefox.

Does YouTube Fullscreen Fit have a free plan?

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

What platforms does YouTube Fullscreen Fit run on?

YouTube Fullscreen Fit runs on the web and embeddable surfaces.

Is YouTube Fullscreen Fit still active?

Unverified. YouTube Fullscreen Fit 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.

Who makes YouTube Fullscreen Fit?

YouTube Fullscreen Fit is developed by Dinoosauro.

When did YouTube Fullscreen Fit launch?

YouTube Fullscreen Fit first shipped in 2023.

Is YouTube Fullscreen Fit open source?

Yes — YouTube Fullscreen Fit is open source under the Open Source license.

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YouTube Fullscreen Fit

Name: YouTube Fullscreen Fit
Author: Dinoosauro

github.comBrowser DevTools & extensions

YouTube Fullscreen Fit is an open-source browser extension that adjusts the YouTube player to fit the available screen when fullscreen mode is opened. It is intended for viewers who want a larger, better-fitting YouTube playback area, particularly on Firefox.

Open SourceWebEmbeddable

Visit github.com

Overview

3 features

YouTube Fullscreen Fit is a Browser DevTools & extensions project. It focuses on making YouTube videos use the full available screen when entering fullscreen mode. YouTube Fullscreen Fit is an open-source project aimed at youTube viewers using Firefox. The project is open source (Open Source). It runs on the web and embeddable surfaces.

Behind YouTube Fullscreen Fit is Dinoosauro, and it first shipped in 2023. Among its 3 catalogued features are fullscreen fitting, youTube player adjustment, and firefox support.

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

Fullscreen fitting
YouTube player adjustment
Firefox support

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of ServiceOpen SourceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed8 Sept · 18:19 UTC
YouTube Fullscreen Fit verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about YouTube Fullscreen Fit

What is YouTube Fullscreen Fit?: YouTube Fullscreen Fit focuses on making YouTube videos use the full available screen when entering fullscreen mode. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use YouTube Fullscreen Fit?: YouTube Fullscreen Fit is an open-source project built for youTube viewers using Firefox.
Does YouTube Fullscreen Fit have a free plan?: Yes — YouTube Fullscreen Fit is open source under the Open Source license and free to use.
What platforms does YouTube Fullscreen Fit run on?: YouTube Fullscreen Fit runs on the web and embeddable surfaces.
Is YouTube Fullscreen Fit still active?: Unverified. YouTube Fullscreen Fit 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.
Who makes YouTube Fullscreen Fit?: YouTube Fullscreen Fit is developed by Dinoosauro.
When did YouTube Fullscreen Fit launch?: YouTube Fullscreen Fit first shipped in 2023.
Is YouTube Fullscreen Fit open source?: Yes — YouTube Fullscreen Fit is open source under the Open Source license.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
Built for: YouTube viewers using Firefox
Model: Open source
Solves: Making YouTube videos use the full available screen when entering fullscreen mode.

Registered as

Firefox Add-ons: youtube-fullscreen-fit

Developer

Dinoosauro

Index record

Indexed: 8 Sept 2026
Lifecycle: Alive
Last seen: 8 Sept 2026

Identity audit (13)

Slug: youtube-fullscreen-fit-github-com
Lifecycle state recorded: 8 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 8 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: Written by a language model from the project's public pages.
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: 8 Sept 2026
Canonical URL: https://github.com/Dinoosauro/youtube-fullscreen-fit

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