StyleInject – Custom CSS Injector

What it can reach

Every site you visit. This extension can read and change the content of any page you open.

• See the address and title of every tab you have open tabs
• Run its own code on the pages it can access scripting
• Act on the current tab, but only after you click it activeTab

The full permission history for this extension →

The publisher

li13599983637 publishes 16 listings we track, 61 users between them. Listed website: fsddsk.com.

1. ReadAloud – Page Text-to-Speech li13599983637 · Productivity · Tools · published 2026-03-02 9 users
2. FocusClock – Time Tracker li13599983637 · Productivity · Tools · published 2026-03-12 7 users
3. CSS Vault li13599983637 · Productivity · Tools · published 2026-03-12 6 users

Like this one

Listings the catalog judges closest in what they say they do.

1. Add CSS - Custom Style Injector Describes nearly the same job, smaller audience 393 users ★ 5.0
2. CSS Overrider Describes nearly the same job, smaller audience 24 users
3. WebCustomizer Describes nearly the same job, smaller audience 4 users
4. CSS Injector Describes nearly the same job, smaller audience 5 users
5. CSS Mage > Inject Custom Styles Into Any Website, iFrames, Import/Export Describes nearly the same job, smaller audience 7 users

The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.