Firefox Browser Add-ons
  • Extensions
  • Themes
    • for Firefox
    • Dictionaries & Language Packs
    • Other Browser Sites
    • Add-ons for Android
Log in
Preview of ComponentLocator

ComponentLocator by Fortunato De Angelis

Alt-click any element in your dev app to open its component source in your editor. Auto-detects Next.js, React, Vue, Svelte, Astro.

Available on Firefox for Android™Available on Firefox for Android™
0 (0 reviews)0 (0 reviews)
Download Firefox and get the extension
Download file
Scan the QR code to open this extension in Firefox for Android

Extension Metadata

Screenshots
About this extension
Click straight from your running app to your code.

Hold Alt (Option on Mac) while hovering yoement under the cursor is highlighted withits component name and source file. Alt+click opens that file in your editor at the exact line.

WORKS WITH YOUR FRAMEWORK — AUTOMATICALLY
ComponentLocator detects how your app was ategy, with zero configuration:

✔ Next.js — App Router and Pages Router, W8 & 19, Server Components (labeled with a"server" badge)
✔ React without Next.js — Vite, Create Rea
✔ Vue 2 & 3 — exact line/column when vite-plugin-vue-inspector or Vue DevTools is present
✔ Svelte 3/4/5 and SvelteKit — exact line/
✔ Astro — .astro templates and framework islands

WHY THIS EXTENSION
Tools built on React's old _debugSource fit 19 and Next.js App Router. This extension reads React 19's new owner stacks (_debugStack) and resolves original source positions through the dev serveown source-map endpoints (Next.js) or the Vite) — and uses each framework's nativedev metadata for Vue, Svelte and Astro.

HOW IT OPENS YOUR EDITOR
By default it auto-detects the dev server't.js, Vue CLI, Nuxt, Create React App) —the same mechanism as the framework's error overlay — so it respects your REACT_EDITOR / EDITOR environment variable. Or configure a custom URL schemef, or JetBrains IDEs.

PRIVACY & SCOPE
Runs only on localhost / 127.0.0.1 development servers. No data is collected, stored remotely, or transmitted
anywhere. Development use only: production.

USAGE
1. Run your app's dev server (next dev, vite, npm run dev…)
2. Open http://localhost:<port>
3. Hold Alt and hover — Alt+click to open the source
Rated 0 by 0 reviewers
Sign in to rate this extension
There are no ratings yet

Star rating saved

5
0
4
0
3
0
2
0
1
0
No reviews yet
Permissions and data

Required permissions:

  • Access your data for localhost
  • Access your data for 127.0.0.1
  • Access your data for 0.0.0.0

Data collection:

  • The developer says this extension doesn't require data collection.
Learn more
More information
Add-on Links
  • Homepage
  • Support site
  • Support Email
  • Copy add-on ID
Version
1.1.5
Size
41.9 KB
Last updated
4 days ago (Jul 15, 2026)
Related Categories
  • Web Development
License
All Rights Reserved
Version History
  • See all versions
Add to collection
Report this add-on
Go to Mozilla’s homepage

Add-ons

  • About
  • Firefox Add-ons Blog
  • Extension Workshop
  • Developer Hub
  • Developer Policies
  • Community Blog
  • Forum
  • Report a bug
  • Review Guide

Download

  • Download Firefox
  • Windows
  • macOS
  • iOS
  • Android
  • Linux
  • All

Latest Builds

  • Nightly
  • Beta

Firefox for Business

  • Enterprise

Community

  • Connect
  • Contribute
  • Developer

Follow

  • Instagram
  • YouTube
  • TikTok
  • Bluesky
  • Podcast
  • Privacy
  • Cookies
  • Legal

Except where otherwise noted, content on this site is licensed under the Creative Commons Attribution Share-Alike License v3.0 or any later version. Android is a trademark of Google LLC.