GPThemes - ChatGPT Customization

Name: GPThemes - ChatGPT Customization
Rating: 4.8235 (17 reviews)
Author: itsmarta

By: itsmarta

Transform ChatGPT's user interface with customisable accent colours and font styles, modern designs and chat bubbles.

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Features & Capabilities

GPThemes transforms the ChatGPT UI by letting you tailor the look and feel. You can adjust chat and prompt widths, including full-width modes for an immersive experience. Personalize fonts—family, size, line height, and letter spacing—for comfortable reading. Pick an accent color with a live preview, and switch between modern themes—Light, Dark, and AMOLED Black—for a sleek, personalized vibe. Toggle chat bubbles to clearly differentiate your messages, and switch themes quickly with a floating button for effortless customization. The result is a clean, spacious layout with subtle animations that enhance readability and flow.

GPThemes is open source and privacy-conscious, storing your preferences locally for a consistent experience. It supports ChatGPT across multiple domains and keeps you informed about updates via GitHub. If you encounter issues, please open an issue on GitHub or contribute on the repository, and consider supporting the project via Ko‑fi.

User Growth & Download Statistics

Add-on AI Design Open Source Accessibility

By:

Daily users:

Rating:

Version:

6.3.1 Last updated: 2026-05-12

Version code:

6258158

Creation date:

2024-01-15

Risk:

Permissions:

storage
https://chat.openai.com/*
https://chatgpt.com/*

Content scripts matches:

chat.openai.com
chatgpt.com

Size:

100.36KB

Email:

gp*****@gmail.com

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-07

Compare stats and ranking:

Ranking

# 5,236 ▼ 57

Other rankings

#3 in gpt-4o keyword 20

#11 in customize keyword 33

#26 in gpt keyword 57 ▲ 1

#29 in gpt4 keyword 15 ▼ 1

#42 in chatgpt keyword 76 ▼ 1

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Other platforms

GPThemes - ChatGPT Widescreen, Fonts & Color (v6.3.1)

6,000 4.90

(67)

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:

itsmarta

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/gpthemes/

Email:

gp*****@gmail.com

Website:

https://github.com/itsmartashub/GPThemes/issues/

Permission Change History

2024-06-12: Version 3.1.0 → 3.1.1

Remove Permissions: notifications tabs

2024-06-09: Version 3.0.1 → 3.1.0

Add Permissions: notifications tabs

2024-05-03: Version 2.0.7 → 2.0.8

Add Permissions: https://chatgpt.com/*

2024-02-04: Version 1.2.0 → 2.0.0

Remove Host permissions: https://chat.openai.com/* http://chat.openai.com/*

Add Permissions: storage https://chat.openai.com/*

User Reviews

This gotta be the best customization for chatGPT, 10/10 aesthetics just a feature request, can you do something for the side panel, a lot ofpeople dont use the all unnecessary features in the side panel, jus make it neat and clean, to look for previous chats

by sh*****, 2026-05-25

Incroyable, tu peut agrandir, modifier la taille de texte, thème, couleur, trop chaud !!

by Fi*****, 2026-03-13

An excellent extension, and I’m really looking forward to future updates. However, a major bug currently prevents me from using it. Without the extension: when a project folder is opened, all discussion threads within that project are properly displayed. Normal behavior. With the extension enabled: only about ten threads are shown. At first, I thought ChatGPT was deleting my older conversations (even though I’m on a paid plan), but that’s not the case. As soon as I disable the extension, all my threads reappear. So I’m looking forward to an update, as this extension genuinely improves the readability of conversations with ChatGPT.

by Fr*****, 2026-02-19

View all user reviews ›

Is GPThemes - ChatGPT Customization 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.

GPThemes - ChatGPT Customization requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Request access to the following domains: openai.com, chatgpt.com
High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****

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.

GPThemes - ChatGPT Customization is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

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