Screen Tester Pro

Name: Screen Tester Pro
Author: BeYor

By: BeYor

Professional display calibration tool. Test dead pixels, backlight bleed, color accuracy, gamma and more - in one click.

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Features & Capabilities

Screen Tester Pro gives you instant access to 10 professional display test patterns directly in your browser:

RGB & CYMW - check color purity and accuracy Gradient - detect banding and bit-depth issues Checkerboard (3 sizes) - pixel sharpness and contrast Focus text - font rendering at all sizes Dead pixels - auto-cycling solid colors to spot stuck pixels 256 colors - full spectrum and grayscale ramps Backlight bleed - pure black for dark-room edge testing Geometry - straight lines, diagonals, and circle for distortion Gamma - dither matching to verify gamma accuracy Subpixel - single-pixel alternating colors for fringing

Features: ✓ Fullscreen mode (F key) ✓ Hide UI for unobstructed testing (H key) ✓ Keyboard shortcuts for all patterns (1–0, arrow keys, Space) ✓ Brightness overlay slider (+/- keys) ✓ Mouse coordinate display ✓ Built-in help screen (? key) ✓ Works 100% offline — no data sent anywhere

User Growth & Download Statistics

Add-on

By:

BeYor

Daily users:

Version:

1.0.1 Last updated: 2026-04-09

Version code:

6210882

Creation date:

2026-04-03

Risk:

Permissions:

tabs

Size:

1.25MB

Email:

be*****@gmail.com

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-05

Compare stats and ranking:

Ranking

# 124,348 ▼ 7,193

Other rankings

#3 in screen caster keyword 73

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:

BeYor

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/screen-tester-pro/

Email:

be*****@gmail.com

Is Screen Tester Pro 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.

Screen Tester Pro requires a few sensitive permissions. 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.

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.

Screen Tester Pro is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

Risk likelihood analysis details

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