CSS Editor
CSS Editor is an open-source Firefox extension for writing and injecting custom CSS into websites in real time. It supports reusable presets and separate CSS configurations for individual sites, serving developers and users who customize web interfaces.
Overview
5 featuresIn the Browser DevTools & extensions space, CSS Editor takes a focused approach. It focuses on customizing website appearance without repeatedly editing site files or rebuilding pages. CSS Editor is an open-source project aimed at web developers and power users. The project is open source (Open Source). It runs on the web and embeddable surfaces.
Keyser2356 builds and maintains CSS Editor, and it first shipped in 2026. Key capabilities include Real-time CSS injection, Custom CSS editing, and preset management.
Summary written by a language model from the project’s public pages.
- Real-time CSS injection
- Custom CSS editing
- Preset management
- Per-site configuration
- Firefox extension
Built with & integrations
Trust & compliance
Indexing history
1What PulseGate has recorded for this listing
Frequently asked questions about CSS Editor
- What does CSS Editor do?
- CSS Editor focuses on customizing website appearance without repeatedly editing site files or rebuilding pages. It is catalogued under Browser DevTools & extensions on PulseGate.
- Who is CSS Editor for?
- CSS Editor is an open-source project built for web developers and power users.
- Does CSS Editor have a free plan?
- Yes — CSS Editor is open source under the Open Source license and free to use.
- What platforms does CSS Editor run on?
- CSS Editor runs on the web and embeddable surfaces.
- Is CSS Editor still active?
- Unverified. CSS Editor 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 projects are similar to CSS Editor?
- Similar projects tracked by PulseGate include CustomCSS Injector, Live CSS Editor Plus, and Custom CSS.CustomCSS InjectorLive CSS Editor PlusCustom CSS
- Who develops CSS Editor?
- CSS Editor is developed by Keyser2356.
- How long has CSS Editor been around?
- CSS Editor first shipped in 2026.
Similar projects
Closest matches by what these projects do