ScriptCat

By: 王一之

Everything can be scripted, allowing your browser to do more!

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Features & Capabilities

ScriptCat is a browser extension that runs user scripts, built to empower your browser with more automation. It provides a framework for background scripts and supports Greasemonkey/Tampermonkey-style scripts, plus a powerful online editor to craft code with ease.

Key features include cloud sync, script subscriptions, compatibility with other user-script managers, background and scheduled scripts, a rich API, a sandbox that safely grants permissions, and an editor with API auto-completion and ESLint.

User Growth & Download Statistics

Add-on Programming Developer Tools Open Source Privacy & Security

By:

Daily users:

Rating:

Version:

0.16.15 Last updated: 2026-05-20

Version code:

6268039

Creation date:

2021-02-28

Risk:

Permissions:

Content scripts matches:

<all_urls>

Size:

4.35MB

Email:

co*****@qq.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-03

Compare stats and ranking:

Ranking

# 783 ▲ 2

Other rankings

#30 in Language Support

#73 in Web Development ▼ 3

#3 in script keyword 27

#7 in education keyword 11

#17 in catalog keyword 7

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Other platforms

ScriptCat (v1.3.2)

100,000 4.48

(69)

ScriptCat (v1.3.2)

2,144,869 4.30

(161)

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:

王一之

Firefox Add-ons Store

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

Email:

co*****@qq.com

Website:

https://github.com/scriptscat/scriptcat

Permission Change History

2025-12-18: Version 0.16.10 → 0.16.12

Remove Permissions: background

2022-10-11: Version 0.9.1 → 0.9.3

Remove Permissions: debugger

User Reviews

Users praise ScriptCat as useful and feature-rich and thank the developers. The dominant issue is incomplete localization: several reviews request proper English (en-GB), note untranslated UI/description text in Chinese, and ask for additional languages such as Brazilian Portuguese. Localization tools/platforms were also mentioned as a possible aid.

Pros

App is useful and works well (users describe it as "very good"/"very useful")
Offers several interesting or valuable features (feature-rich)
Positive sentiment toward the developers (users thank/appreciate the devs)

Cons

Incomplete or poor English translation — many interface strings are still in Chinese
Description and some UI text are untranslated or inconsistent (makes it hard to use for non-Chinese speakers)
Requests for additional locales (notably Brazilian Portuguese/Portuguese) — localization support is lacking

Recent reviews

by Ka*****, 2026-05-22

by *****, 2026-04-19

by Re*****, 2026-03-21

View all user reviews ›

Is ScriptCat 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.

ScriptCat requires a lot of 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.
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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.

ScriptCat 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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