PerfectPixel by WellDoneCode (pixel perfect)

Name: PerfectPixel by WellDoneCode (pixel perfect)
Rating: 4.6774 (31 reviews)
Author: WELLDONECODE

By: WELLDONECODE Add-on

Drop your mockup on the live page for pixel-perfect comparison with your code.

Overview

Firefox Add-ons Store

Daily users

271 ▲ 31

Data as of 2026-10-15

Rating:

4.68

(31)

Version:

3.2.0.6

Last updated: 2026-10-12

Features & Capabilities

PerfectPixel adds a semi-transparent image overlay on top of any web page, letting you compare your frontend implementation against the original design mockup directly in the browser. Upload a design comp, adjust opacity, and immediately see where your code diverges from the spec — with pixel-perfect accuracy. No more switching between tabs or squinting at two screens side by side.

How it works: install the extension, open any page, and drop in an image - drag and drop, paste a URL, or use the file picker. Position and scale the overlay, then adjust opacity to compare.

Features:

Overlay any PNG, JPG, or SVG on any web page
Adjustable opacity for real-time visual comparison
4 blend modes (Difference, Invert, Multiply, Overlay) plus Normal — each useful for catching different types of mismatches
Lock the overlay to click through it and interact with page elements underneath
Per-domain persistence: your layers stay saved per site and restore automatically across browser sessions
Multiple layers per domain
Scaling, repositioning, and centering controls
Keyboard shortcuts for common actions

Pro features:

Unlimited simultaneous layers (free tier supports 2)
Folders to group layers
Layer rotation
Dark theme
Custom icon, accent color, and custom CSS

Built for frontend developers, QA engineers, agencies, and development teams who need to verify that what they shipped matches what was designed.

Official Firefox version of Chrome Web Store extension with 350,000+ users.

User Growth & Download Statistics

Add-on

By:

Daily users:

Rating:

Version:

3.2.0.6 Last updated: 2026-10-12

Version code:

6568254

Creation date:

2015-10-12

Firefox add-on GUID:

{4c47d1b1-c33d-4b05-908f-90c05bf6e2ab}

Firefox add-on numeric ID:

661936

Weekly download count:

Firefox on Android:

Risk:

Permissions:

Host permissions:

<all_urls>

Size:

1.17MB

Email:

su*****@welldonecode.com

Website:

http://www.welldonecode.com/perfectpixel DR 48

Privacy policy:

https://addons.mozilla.org/firefox/addon/perfectpixel/privacy/

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-10-15

Compare stats and ranking:

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:: WELLDONECODE
Firefox Add-ons Store: https://addons.mozilla.org/firefox/addon/perfectpixel/
Email:: su*****@welldonecode.com
Website:: http://www.welldonecode.com/perfectpixel

Permission Change History

2026-10-13: Version 3.1.1.7 → 3.2.0.6

Add Optional permissions: clipboardRead

Is PerfectPixel by WellDoneCode (pixel perfect) 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.

PerfectPixel by WellDoneCode (pixel perfect) requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.

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.

PerfectPixel by WellDoneCode (pixel perfect) is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
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