CSS Injector icon

CSS Injector

by dev.muneeb101@gmail.com · Developer Tools
Manifest V3 Free
View in Chrome Web Store Data as of 16 Oct 2026

Quickly apply and persist custom CSS on specific domains for debugging, UI testing, and experiment styling.

Users
20
+3 in 30 days
Rating
5.0 / 5
unchanged in 30 days
Ratings
1
0 in 30 days
Store rank
#151K
#126K among extensions
Version
1.0.0
updated 17 Mar 2026

Users

monthly, 7 months
01020Mar 2026Jul 2026Oct 2026
Latest, 16 Oct 2026: 20 usersMove the mouse over the chart for any month

Ratings count

monthly, 7 months
001Mar 2026Jul 2026Oct 2026
Latest, 16 Oct 2026: 1 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About CSS Injector

Take Control of the DOM with CSS Injector CSS Injector is the minimalist, high-performance tool built for developers and designers who need to modify the web on the fly. No more messing with DevTools "Sources" panels that disappear on refresh. With CSS Injector, your styles are live, local, and persistent. Whether you’re fixing a stubborn z-index issue, prototyping a dark mode, or cleaning up a cluttered dashboard, CSS Injector gives you a dedicated workspace to rewrite the web’s visual layer without touching a single source file. 💡 Key Features Persistent Styling: Custom CSS is automatically saved via chrome.storage.local. Your changes stay active across refreshes and return visits to the domain. Domain-Specific Injection: Styles are tied to the specific domain you're working on, ensuring your experiments don't bleed into other tabs. Real-Time Preview: See your UI changes instantly as you type in the clean, distraction-free popup editor. Lightweight & Fast: Zero bloat. It’s designed to be a high-performance alternative to heavy "user style" managers. 🛠 Who is this for? Web Developers: Quickly test fixes for layout bugs or experiment with flexbox/grid configurations without triggering a full environment rebuild. UI/UX Designers: Prototype high-fidelity visual changes on live sites to show stakeholders exactly how a new margin or color palette looks in production. Pro Tip: Because CSS Injector uses local storage, your styles are kept private on your machine, perfect for internal dev environments and staging sites.

Growth

WindowUsersChangeRatingsRating
7 days−2−9.1%00.00
30 days+3+17.6%00.00
6 months+16+400.0%00.00

Version history

1 versions recorded
1.0.017 Mar 2026

Details

Category
Developer Tools
First seen
17 Mar 2026
Size
24 KB
Languages
en
Pricing
Free
Privacy policy
docs.google.com
Extension ID
iioibhhblnnbmoiojlknkpglbkfbdbll

Permissions and risk

Moderate riskimpact 2, likelihood 2
Permissions
activeTabstorage
Site access
http://*/*https://*/*
Can read and change data on every website you visit.

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