CSS/JS Inject
CSS/JS Inject is a Firefox browser extension that lets users apply custom CSS and JavaScript to websites. It includes controls for managing injections across sites and activating or deactivating them, making it useful for web customization and development testing.
Overview
6 featuresCSS/JS Inject sits in PulseGate's Browser DevTools & extensions category. It focuses on customizing and testing web pages without modifying their source code. CSS/JS Inject is an open-source project aimed at firefox users, web developers, and site designers. The project is open source (Open Source). It runs on the web and embeddable surfaces.
Freiholtz builds and maintains CSS/JS Inject, and it first shipped in 2025. Key capabilities include CSS injection, javaScript injection, and site-specific rules. The interface is available in 32 languages, including Czech, German, and Greek.
Summary written by a language model from the project’s public pages.
- CSS injection
- JavaScript injection
- Site-specific rules
- Injection management
- Enable or disable injections
- All-sites overview
Built with & integrations
Trust & compliance
Indexing history
1What PulseGate has recorded for this listing
Frequently asked questions about CSS/JS Inject
- What is CSS/JS Inject?
- CSS/JS Inject focuses on customizing and testing web pages without modifying their source code. It is catalogued under Browser DevTools & extensions on PulseGate.
- Who should use CSS/JS Inject?
- CSS/JS Inject is an open-source project built for firefox users, web developers, and site designers.
- Does CSS/JS Inject have a free plan?
- Yes — CSS/JS Inject is open source under the Open Source license and free to use.
- What platforms does CSS/JS Inject run on?
- CSS/JS Inject runs on the web and embeddable surfaces.
- Is CSS/JS Inject still active?
- Unverified. CSS/JS Inject has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
- What are alternatives to CSS/JS Inject?
- Similar projects tracked by PulseGate include CustomCSS Injector, JS Injector, and Custom CSS.CustomCSS InjectorJS InjectorCustom CSS
- Who makes CSS/JS Inject?
- CSS/JS Inject is developed by Freiholtz.
- How long has CSS/JS Inject been around?
- CSS/JS Inject first shipped in 2025.
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