# Fullscreen Clock

> Shows the current time in the top-right corner when a page enters fullscreen.

Canonical page: [https://chrome-stats.com/d/fullscreen-clock](https://chrome-stats.com/d/fullscreen-clock)

## Overview

- **ID:** `fullscreen-clock`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** upsuper
- **Category:** appearance,games-entertainment
- **Daily users:** 4
- **Version:** 1.0.0
- **Last updated:** 2026-04-30
- **First published:** 2026-04-27
- **Size:** 26 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/fullscreen-clock/)
- **Website:** [https://github.com/upsuper/firefox-fullscreen-clock](https://github.com/upsuper/firefox-fullscreen-clock)

## Description

Fullscreen Clock is a Firefox add-on that allows you to display a clock in fullscreen mode. Stay on top of time with this convenient and customizable feature.

## Rankings

- #49,056 — Overall
- #152 — clock

## Permissions and access

### Permissions

- `storage`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [Flexible Overlay Clock](https://chrome-stats.com/d/flex-overlay-clock) — 19 users, 5.00 / 5
- [Small Clock](https://chrome-stats.com/d/small-clock) — 570 users, 4.38 / 5
- [Transparent Web Clock](https://chrome-stats.com/d/transparent-web-clock)
- [Floating Time Display](https://chrome-stats.com/d/floating-time-display)
- [Digital Clock](https://chrome-stats.com/d/digitalclock) — 104 users, 4.40 / 5
- [Sexy LCD clock](https://chrome-stats.com/d/sexy-lcd-clock) — 23 users, 3.70 / 5
- [Clock Dynamic Theme](https://chrome-stats.com/d/clock-dynamic-theme)
- [Toolbar Clock](https://chrome-stats.com/d/toolbar-clock-1) — 1 users
- [Clock-Minute](https://chrome-stats.com/d/clock-minute)
- [Toolbar Clock](https://chrome-stats.com/d/toolbar-clock-atc) — 5 users
- [Fixed Position Clock](https://chrome-stats.com/d/fixed-position-clock)
- [Page Time Overlay](https://chrome-stats.com/d/page-time-overlay)

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Source: [Chrome-Stats](https://chrome-stats.com/d/fullscreen-clock)