Boost:  JavaScript & CSS Injector icon

Boost: JavaScript & CSS Injector

by KS Lau

v2.5.3 Updated Mar 20, 2026 560KiB
CWS
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Description

A powerful, mobile-friendly browser extension that allows you to edit and inject custom JavaScript and CSS on any website per-domain. Core Features • Cross-Platform Compatibility: Works seamlessly on desktop browsers (Chrome, Firefox, Edge) and mobile browsers including Orion Browser on iOS • Per-Domain Customization: Apply different JavaScript and CSS scripts to different websites automatically • Real-time Injection: Scripts are injected immediately when enabled - no page reload required • Syntax Highlighting: Professional code editors with JavaScript and CSS syntax highlighting • Mobile-Optimized UI: Responsive interface that adapts to mobile screens with touch-friendly controls • Toggle Control: Easily enable/disable scripts for any domain with one tap • Persistent Storage: Your scripts are reliably saved across browser sessions • CSP Bypass: Works on sites with strict Content Security Policy • Large Script Support: Handles scripts larger than 100KB with chunked storage • Light mode and Dark mode support Perfect for: • Customizing website appearances with CSS • Adding functionality with JavaScript • Removing ads and unwanted elements • Creating custom themes • Automating repetitive tasks
Boost:  JavaScript & CSS Injector screenshot 1Boost:  JavaScript & CSS Injector screenshot 2

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Permissions (4)

Permissions

scripting Can inject scripts into web pages storage Can store data locally in your browser tabs Can see your open tabs and their URLs webNavigation Can monitor navigation events

Details

Version 2.5.3
Updated Mar 20, 2026
Size 560KiB
First Seen Mar 27, 2026