Firefox Add-ons

2Versions

0Code reviewed

Not reviewed

No code review on record

We have not reviewed this extension’s code, so we cannot vouch for it either way. Check the permissions below to decide whether it asks for more than it needs.

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300 indicators in this extension

300 indicators

0 versions analysed

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What our analysis found

Stylish - Custom themes for any website, used by 20,487 people, is not yet reviewed by Extension Auditor. Its permissions mean it can read and change data on all websites and can observe network requests. It comes from a publisher with 2 extensions and was last updated in April 2024.

Stylish - Custom themes for any website Firefox extension security report

ID: stylish

Extension Info & Metadata

Status

Active

Version

3.1.9resigned1

Size

1.89 MB

Rating

2.7/5

Reviews

978

Users

20,487

Type

Extension

Updated

Apr 25, 2024

Publisher Contextual Analysis

Author: userstyles.org
Privacy: Privacy Policy
MX records exist: Yes
Domain exists: Yes
Is disposable: No
Is role-based: Yes
Mailbox exists: Yes
Website: Visit

Extensions

Active

Obsolete

Listed

Unlisted

Users

41,397

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Screenshots & videos

Install growth

User Growth

No data available

No user growth data available for this extension

Rating Count

No data available

No rating count data available for this extension

Average Rating

No data available

No rating data available for this extension

See plans

React Flow

Internal permhash`78ce3c84df…`
3 malicious

8 other extensions carry this fingerprint; 3 of the cluster are known malicious.

Withheldmalicious
Withheldmalicious
Withheldmalicious
Withheldnot flagged
Withheldnot flagged
Withheldnot flagged
Withheldnot flagged
+1 more

Permhash (Mandiant)`ba26fef51d…`
2 malicious

4 other extensions carry this fingerprint; 2 of the cluster are known malicious.

Withheldmalicious
Withheldmalicious
Withheldnot flagged
Withheldnot flagged

Network indicators

292 URLs and 8 IP literals were extracted from this version.

Item	Type	Severity	Description
webRequest	Permission	Critical	This permission enables the extension to monitor and analyze all web requests made by the browser. Rated Critical because it can observe all network traffic including sensitive data, track browsing behavior, and gather authentication tokens.
:///*	Host	Critical	Broad host access — the extension can read/modify content on every website.
<all_urls>	Risk Factor	Critical	This permission grants access to all websites without restriction. Rated High because it can access any web content, monitor all web activity, and potentially steal sensitive data across all sites.
webNavigation	Permission	High	This permission enables monitoring of all browser navigation events and transitions. Rated High because it can track every page visit, navigation method, and browsing pattern, potentially exposing sensitive browsing behavior and user activities.
Contextual Risk Factors	Risk Factor	High	The following context increases the overall risk:• 20% increase: Access to sensitive domains increases potential impact• 10% increase: Early script execution enables pre-emptive content manipulation• 15% increase: Older manifest version lacks modern security controls
Broad Host Permissions	Risk Factor	High	This extension has broad host permissions allowing it to access many or all websites.
Broad Content Script Access	Risk Factor	High	This extension can inject scripts into any website.
tabs	Permission	Medium	This permission enables tab management and monitoring. Rated Medium because it can track open tabs, access tab metadata, and monitor user browsing patterns.
storage	Permission	Medium	This permission allows storing data locally in the browser. Rated Medium because it can persist sensitive user data, track user activities over time, and potentially store malicious payloads.
Access to Sensitive Domains	Risk Factor	Medium	This extension requests access to sensitive domains: ://www.google.com/, ://www.google.ac/, ://www.google.ad/, ://www.google.com.af/, ://www.google.com.ag/, ://www.google.com.ai/, ://www.google.am/, ://www.google.it.ao/, ://www.google.com.ar/, ://www.google.as/, ://www.google.at/, ://www.google.com.au/, ://www.google.az/, ://www.google.ba/, ://www.google.com.bd/, ://www.google.be/, ://www.google.bf/, ://www.google.bg/, ://www.google.com.bh/, ://www.google.bi/, ://www.google.bj/, ://www.google.com.bn/, ://www.google.com.bo/, ://www.google.com.br/, ://www.google.bs/, ://www.google.co.bw/, ://www.google.com.by/, ://www.google.by/, ://www.google.com.bz/, ://www.google.ca/, ://www.google.com.kh/, ://www.google.cc/, ://www.google.cd/, ://www.google.cf/, ://www.google.cat/, ://www.google.cg/, ://www.google.ch/, ://www.google.ci/, ://www.google.co.ck/, ://www.google.cl/, ://www.google.cm/, ://www.google.cn/, ://www.google.com.co/, ://www.google.co.cr/, ://www.google.com.cu/, ://www.google.cv/, ://www.google.com.cy/, ://www.google.cz/, ://www.google.de/, ://www.google.dj/, ://www.google.dk/, ://www.google.dm/, ://www.google.com.do/, ://www.google.dz/, ://www.google.com.ec/, ://www.google.ee/, ://www.google.com.eg/, ://www.google.es/, ://www.google.com.et/, ://www.google.fi/, ://www.google.com.fj/, ://www.google.fm/, ://www.google.fr/, ://www.google.ga/, ://www.google.gd/, ://www.google.ge/, ://www.google.gf/, ://www.google.gg/, ://www.google.com.gh/, ://www.google.com.gi/, ://www.google.gl/, ://www.google.gm/, ://www.google.gp/, ://www.google.gr/, ://www.google.com.gt/, ://www.google.gy/, ://www.google.com.hk/, ://www.google.hn/, ://www.google.hr/, ://www.google.ht/, ://www.google.hu/, ://www.google.co.id/, ://www.google.iq/, ://www.google.ie/, ://www.google.co.il/, ://www.google.im/, ://www.google.co.in/, ://www.google.io/, ://www.google.is/, ://www.google.it/, ://www.google.je/, ://www.google.com.jm/, ://www.google.jo/, ://www.google.co.jp/, ://www.google.co.ke/, ://www.google.ki/, ://www.google.kg/, ://www.google.co.kr/, ://www.google.com.kw/, ://www.google.kz/, ://www.google.la/, ://www.google.com.lb/, ://www.google.com.lc/, ://www.google.li/, ://www.google.lk/, ://www.google.co.ls/, ://www.google.lt/, ://www.google.lu/, ://www.google.lv/, ://www.google.com.ly/, ://www.google.co.ma/, ://www.google.md/, ://www.google.me/, ://www.google.mg/, ://www.google.mk/, ://www.google.ml/, ://www.google.mn/, ://www.google.ms/, ://www.google.com.mt/, ://www.google.mu/, ://www.google.mv/, ://www.google.mw/, ://www.google.com.mx/, ://www.google.com.my/, ://www.google.co.mz/, ://www.google.com.na/, ://www.google.ne/, ://www.google.com.nf/, ://www.google.com.ng/, ://www.google.com.ni/, ://www.google.nl/, ://www.google.no/, ://www.google.com.np/, ://www.google.nr/, ://www.google.nu/, ://www.google.co.nz/, ://www.google.com.om/, ://www.google.com.pa/, ://www.google.com.pe/, ://www.google.com.ph/, ://www.google.com.pk/, ://www.google.pl/, ://www.google.pn/, ://www.google.com.pr/, ://www.google.ps/, ://www.google.pt/, ://www.google.com.py/, ://www.google.com.qa/, ://www.google.ro/, ://www.google.rs/, ://www.google.ru/, ://www.google.rw/, ://www.google.com.sa/, ://www.google.com.sb/, ://www.google.sc/, ://www.google.se/, ://www.google.com.sg/, ://www.google.sh/, ://www.google.si/, ://www.google.sk/, ://www.google.com.sl/, ://www.google.sn/, ://www.google.sm/, ://www.google.so/, ://www.google.st/, ://www.google.com.sv/, ://www.google.td/, ://www.google.tg/, ://www.google.co.th/, ://www.google.com.tj/, ://www.google.tk/, ://www.google.tl/, ://www.google.tm/, ://www.google.to/, ://www.google.com.tn/, ://www.google.com.tr/, ://www.google.tt/, ://www.google.com.tw/, ://www.google.co.tz/, ://www.google.com.ua/, ://www.google.ua/, ://www.google.co.ug/, ://www.google.ae/, ://www.google.co.uk/, ://www.google.us/, ://www.google.com.uy/, ://www.google.co.uz/, ://www.google.com.vc/, ://www.google.co.ve/, ://www.google.vg/, ://www.google.co.vi/, ://www.google.com.vn/, ://www.google.vn/, ://www.google.vu/, ://www.google.ws/, ://www.google.co.za/, ://www.google.co.zm/, ://www.google.co.zw/
Early Content Script Execution	Risk Factor	Medium	This extension runs content scripts at document_start.
Older Manifest Version	Risk Factor	Medium	This extension uses Manifest Version 2
contextMenus	Permission	Low	This permission adds items to browser context menus. Rated Medium because it only modifies right-click menus without access to page content.

Sensitive Domain Access

This extension has access to the following sensitive domains:

*://www.google.com/*
*://www.google.ac/*
*://www.google.ad/*
*://www.google.com.af/*
*://www.google.com.ag/*
*://www.google.com.ai/*
*://www.google.am/*
*://www.google.it.ao/*
*://www.google.com.ar/*
*://www.google.as/*
*://www.google.at/*
*://www.google.com.au/*
*://www.google.az/*
*://www.google.ba/*
*://www.google.com.bd/*
*://www.google.be/*
*://www.google.bf/*
*://www.google.bg/*
*://www.google.com.bh/*
*://www.google.bi/*
*://www.google.bj/*
*://www.google.com.bn/*
*://www.google.com.bo/*
*://www.google.com.br/*
*://www.google.bs/*
*://www.google.co.bw/*
*://www.google.com.by/*
*://www.google.by/*
*://www.google.com.bz/*
*://www.google.ca/*
*://www.google.com.kh/*
*://www.google.cc/*
*://www.google.cd/*
*://www.google.cf/*
*://www.google.cat/*
*://www.google.cg/*
*://www.google.ch/*
*://www.google.ci/*
*://www.google.co.ck/*
*://www.google.cl/*
*://www.google.cm/*
*://www.google.cn/*
*://www.google.com.co/*
*://www.google.co.cr/*
*://www.google.com.cu/*
*://www.google.cv/*
*://www.google.com.cy/*
*://www.google.cz/*
*://www.google.de/*
*://www.google.dj/*
*://www.google.dk/*
*://www.google.dm/*
*://www.google.com.do/*
*://www.google.dz/*
*://www.google.com.ec/*
*://www.google.ee/*
*://www.google.com.eg/*
*://www.google.es/*
*://www.google.com.et/*
*://www.google.fi/*
*://www.google.com.fj/*
*://www.google.fm/*
*://www.google.fr/*
*://www.google.ga/*
*://www.google.gd/*
*://www.google.ge/*
*://www.google.gf/*
*://www.google.gg/*
*://www.google.com.gh/*
*://www.google.com.gi/*
*://www.google.gl/*
*://www.google.gm/*
*://www.google.gp/*
*://www.google.gr/*
*://www.google.com.gt/*
*://www.google.gy/*
*://www.google.com.hk/*
*://www.google.hn/*
*://www.google.hr/*
*://www.google.ht/*
*://www.google.hu/*
*://www.google.co.id/*
*://www.google.iq/*
*://www.google.ie/*
*://www.google.co.il/*
*://www.google.im/*
*://www.google.co.in/*
*://www.google.io/*
*://www.google.is/*
*://www.google.it/*
*://www.google.je/*
*://www.google.com.jm/*
*://www.google.jo/*
*://www.google.co.jp/*
*://www.google.co.ke/*
*://www.google.ki/*
*://www.google.kg/*
*://www.google.co.kr/*
*://www.google.com.kw/*
*://www.google.kz/*
*://www.google.la/*
*://www.google.com.lb/*
*://www.google.com.lc/*
*://www.google.li/*
*://www.google.lk/*
*://www.google.co.ls/*
*://www.google.lt/*
*://www.google.lu/*
*://www.google.lv/*
*://www.google.com.ly/*
*://www.google.co.ma/*
*://www.google.md/*
*://www.google.me/*
*://www.google.mg/*
*://www.google.mk/*
*://www.google.ml/*
*://www.google.mn/*
*://www.google.ms/*
*://www.google.com.mt/*
*://www.google.mu/*
*://www.google.mv/*
*://www.google.mw/*
*://www.google.com.mx/*
*://www.google.com.my/*
*://www.google.co.mz/*
*://www.google.com.na/*
*://www.google.ne/*
*://www.google.com.nf/*
*://www.google.com.ng/*
*://www.google.com.ni/*
*://www.google.nl/*
*://www.google.no/*
*://www.google.com.np/*
*://www.google.nr/*
*://www.google.nu/*
*://www.google.co.nz/*
*://www.google.com.om/*
*://www.google.com.pa/*
*://www.google.com.pe/*
*://www.google.com.ph/*
*://www.google.com.pk/*
*://www.google.pl/*
*://www.google.pn/*
*://www.google.com.pr/*
*://www.google.ps/*
*://www.google.pt/*
*://www.google.com.py/*
*://www.google.com.qa/*
*://www.google.ro/*
*://www.google.rs/*
*://www.google.ru/*
*://www.google.rw/*
*://www.google.com.sa/*
*://www.google.com.sb/*
*://www.google.sc/*
*://www.google.se/*
*://www.google.com.sg/*
*://www.google.sh/*
*://www.google.si/*
*://www.google.sk/*
*://www.google.com.sl/*
*://www.google.sn/*
*://www.google.sm/*
*://www.google.so/*
*://www.google.st/*
*://www.google.com.sv/*
*://www.google.td/*
*://www.google.tg/*
*://www.google.co.th/*
*://www.google.com.tj/*
*://www.google.tk/*
*://www.google.tl/*
*://www.google.tm/*
*://www.google.to/*
*://www.google.com.tn/*
*://www.google.com.tr/*
*://www.google.tt/*
*://www.google.com.tw/*
*://www.google.co.tz/*
*://www.google.com.ua/*
*://www.google.ua/*
*://www.google.co.ug/*
*://www.google.ae/*
*://www.google.co.uk/*
*://www.google.us/*
*://www.google.com.uy/*
*://www.google.co.uz/*
*://www.google.com.vc/*
*://www.google.co.ve/*
*://www.google.vg/*
*://www.google.co.vi/*
*://www.google.com.vn/*
*://www.google.vn/*
*://www.google.vu/*
*://www.google.ws/*
*://www.google.co.za/*
*://www.google.co.zm/*
*://www.google.co.zw/*

300 indicators in this extension

300 indicators

0 versions analysed

Every finding is verified by a security analyst. Unlock the code evidence, indicators and version history.

Unlock this report — $4.99 Start 7-day trial — all reports

One-time payment · Secure checkout by Stripe

About this extension

Stylish lets you customize any website with custom user styles (themes for websites). Choose from the largest userstyles library to change the color scheme, background, and skin for Google, Facebook, YouTube and many, many more sites.

User reviews

1.3 out of 5 · 10 most recent reviews

Text reviews

Positive

Negative

Do not use this extension, it spies on you. Use Stylus instead.

Firefox user 18282152·19 Jun 2026

Israeli spyware distributed by Similarweb Ltd.

Firefox user 19966135·3 Jun 2026

Spyware that sells all your chat history data on AI chatbot websites like ChatGPT, Claude, etc. SELLS your data, and is just an evil company.

Extension files

Browse and explore files within this extension package

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URLs

292

IPv4

URLs

View the external URLs this extension communicates with to understand its network activity and data interactions.

No URLs found

No IP addresses found

300 indicators in this extension

300 indicators

0 versions analysed

Every finding is verified by a security analyst. Unlock the code evidence, indicators and version history.

Unlock this report — $4.99 Start 7-day trial — all reports

One-time payment · Secure checkout by Stripe

Version	Size	Verdict	Findings	Permhash
3.1.8 Latest	1.85 MB	Not scanned	—	ba26fef51d56f7d7571b1afceaedda346b60c02adc2045e3f848d27985a59537
3.1.9resigned1	1.89 MB	Not scanned	—	ba26fef51d56f7d7571b1afceaedda346b60c02adc2045e3f848d27985a59537

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Code Diff

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No comparable text files found between these versions.

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Not reviewed

300 indicators in this extension

What our analysis found