Reviews of Stylish - Custom themes for any website

By: userstyles.org Add-on

List of user reviews and ratings for Stylish - Custom themes for any website

Total ratings

2.73 (Rating count: 978)

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Review summary

Overall sentiment is strongly negative: reviewers accuse Stylish of spyware and data collection, complain that the style site is broken and inaccessible, and note the extension often doesn’t function. Several reviews advise switching to Stylus as a safer alternative. A minority mention the ability to apply themes as a potential positive, but reliability and privacy concerns dominate.

Pros

Cons

Spyware / privacy concerns: multiple reviews claim the extension steals or monitors browsing data.
The style site (userstyles.org) is frequently broken or unreachable (bad gateway/502), hindering access to themes.
The extension is reported as not working or dead on Firefox by several users.
Stylus is repeatedly recommended as a safer, more reliable alternative.

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User Reviews

Recent rating average: 1.00

All time rating average: 2.73

Upgrade to see all 231 reviews

57% (131)

Date	Author	Comment
2026-08-13	Pa*****

2026-06-19	Fi*****	Do not use this extension, it spies on you. Use Stylus instead.
Do not use this extension, it spies on you. Use Stylus instead.
2026-06-03	Fi*****	Israeli spyware distributed by Similarweb Ltd.
Israeli spyware distributed by Similarweb Ltd.
2026-06-02	tr*****	Stylish has been exposed as spyware. They are spying on you, recording your online activities including your AI chats. This extension should be removed from the extension store.
Stylish has been exposed as spyware. They are spying on you, recording your online activities including your AI chats. This extension should be removed from the extension store.
2026-06-02	Vi*****	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.
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.
2026-06-01	wo*****

2026-05-25	Si*****

2026-05-24	sh*****

2026-04-10	Fi*****	SPYWARE!!! "Consider uninstalling the malicious Stylish extension. In 2016, with no input from the userbase, through some guy, pretending to be an independent developer, it basically was sold to a shady web analytics company, Similarweb. Since then, it is actively sharing your entire non-anonymized browsing history demo with them, assuming you ever clicked on one of the flashy "Agree" buttons. It initially did this without even asking for consent, and was banned from extension stores afterwards. Currently, it still breaks store policies, yet is not banned for unknown to me reasons. This website only works with the Stylus extension, which is an open-source privacy-friendly fork of the now-malicious Stylish extension." (Text from the UserStyles.org archive) TL;DR This extension is SPYWARE and you should use the 'Stylus' extension instead.
SPYWARE!!! "Consider uninstalling the malicious Stylish extension. In 2016, with no input from the userbase, through some guy, pretending to be an independent developer, it basically was sold to a shady web analytics company, Similarweb. Since then, it is actively sharing your entire non-anonymized browsing history demo with them, assuming you ever clicked on one of the flashy "Agree" buttons. It initially did this without even asking for consent, and was banned from extension stores afterwards. Currently, it still breaks store policies, yet is not banned for unknown to me reasons. This website only works with the Stylus extension, which is an open-source privacy-friendly fork of the now-malicious Stylish extension." (Text from the UserStyles.org archive) TL;DR This extension is SPYWARE and you should use the 'Stylus' extension instead.
2026-03-18	jo*****