User JavaScript and CSS

User JavaScript and CSS on any website

What is User JavaScript and CSS?

User JavaScript and CSS is a Chrome extension that allows users to easily inject their own JavaScript or CSS rules to any webpage. It features instant execution, custom libs include, and URL masking to use one script or CSS on many pages. The extension has gone through several updates and improvements, making it a versatile tool for customizing webpages.

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Stats

By: tenRabbits

View on Chrome Web Store

Users: 100,000+

Rating: 4.80 (493) ▼ 0.01

Version: 3.0.3 (Last updated: 2024-06-07)

Creation date: 2020-05-08

Risk impact: High risk impact

Risk likelihood: Very low risk likelihood

Manifest version: 3

Permissions:

storage
tabs
unlimitedStorage
userScripts
scripting

Host permissions:

http://*/
https://*/

Size: 1.70M

Email: sq*****@yandex.ru

Stats date:

Chrome-Stats Rank

# 1772

Other rankings

#27 in Developer Tools ▲ 1

#1 in javascript keyword 44 ▲ 1

#10 in css editor keyword 29

#13 in jquery keyword 16

#36 in inject keyword 7

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Other platforms

Not available on Firefox

Not available on Edge

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Summary

Analyze keywords

Userscript's and userstyle's — simple extension to inject own JavaScript or CSS rules to any page.

Features:

Instant execution
Custom libs include
URL masking allows use one script or CSS on many pages

Change log:

Version 3.0.3 beta

modules are now in the same scope
CSS injection improvement
and other minor fixes

Version 3.0.2 beta

User reviews

User reviews summary

These summaries are automatically generated weekly using AI based on recent user reviews. Chrome Web Store does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.

Pros

Very useful for adjusting/improving UI/UX for poorly designed websites
Great for web front-end development and testing client site changes
Ability to load local CSS and JS
Support for distinct user profiles would add significant value

Cons

Issues with CSS not working after update
jQuery errors on popup modals after update
Unconvenient implementation of URL pattern hints
Flash of old CSS before changes take effect

Most mentioned

CSS not working after update
Local CSS/JS loading
Need for support of distinct user profiles

Recent reviews

Can you add support (checkbox or something like that) to ignore comments. I have wrote some js/css scripts, something I cannot use and I just comment them (for example I don't need for now my custom javascript on website, I'm just commenting it and that's all), but if I check on the website, I see this comment on page, can you add possibility to not js/css comments on the page (just remove them)? Thank you!

Dan Rotaru, 2024-04-18

faced the same issue (css not working) after the update, hope it can be fixed as soon as possible I had used this extension since 2019, it's my favourite extension to adjust / improve ui / ux for poor design of some website ----------- Edited: Thanks for the fast response, I had sent you the feedback via email

Ch Kwang, 2024-06-07

Great extension but not too much customization. Suggestion for developer: - add possibility to share your piece of code with others (ability to install my code for other users); - add possibility to create custom snippets in editor (for now autocomplete works not as well as I want), so this feature will fix it; - add One Dark Theme, idk why this theme is not added, is the most popular theme in VS Code, Jetbrains editors... - can't choose editor font family But in general it's ok, good job!

Dan Rotaru, 2024-03-22

View all user reviews

Safety

Risk impact

User JavaScript and CSS is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this extension. Review carefully before installing. We recommend that you only install User JavaScript and CSS if you trust the publisher.