Who is Toggle CSS outline for?

Toggle CSS outline is a B2B product built for web developers and CSS designers.

Does Toggle CSS outline have a free plan?

Yes — Toggle CSS outline is free to use.

What platforms does Toggle CSS outline run on?

Toggle CSS outline runs on the web and embeddable surfaces.

Is Toggle CSS outline still active?

Unverified. Toggle CSS outline 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.

Who makes Toggle CSS outline?

Toggle CSS outline is developed by theodejager.

How long has Toggle CSS outline been around?

Toggle CSS outline first shipped in 2023.

Is Toggle CSS outline open source?

Toggle CSS outline has a public GitHub repository.

Back to the index

Toggle CSS outline

Name: Toggle CSS outline
Author: theodejager

mozilla.orgBrowser DevTools & extensions

Toggle CSS outline is a Firefox browser extension that adds a toolbar button for toggling a red outline around every element on a webpage. It helps web developers inspect page structure and layout during CSS development without opening developer tools.

FreeWebEmbeddable

Visit mozilla.org

Overview

5 features

Toggle CSS outline is a Browser DevTools & extensions project. It focuses on seeing webpage element boundaries quickly while debugging CSS without opening browser developer tools. It is built as a B2B product for web developers and CSS designers. Toggle CSS outline is free to use. It runs on the web and embeddable surfaces.

Behind Toggle CSS outline is theodejager, and it first shipped in 2023. Among its 5 catalogued features are toolbar button, element outlines, and CSS debugging. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

Toolbar button
Element outlines
CSS debugging
One-click toggle
All-page coverage

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierGitHubMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed12 Sep · 23:29 UTC
Toggle CSS outline verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Toggle CSS outline

What does Toggle CSS outline do?: Toggle CSS outline focuses on seeing webpage element boundaries quickly while debugging CSS without opening browser developer tools. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Toggle CSS outline for?: Toggle CSS outline is a B2B product built for web developers and CSS designers.
Does Toggle CSS outline have a free plan?: Yes — Toggle CSS outline is free to use.
What platforms does Toggle CSS outline run on?: Toggle CSS outline runs on the web and embeddable surfaces.
Is Toggle CSS outline still active?: Unverified. Toggle CSS outline 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.
Who makes Toggle CSS outline?: Toggle CSS outline is developed by theodejager.
How long has Toggle CSS outline been around?: Toggle CSS outline first shipped in 2023.
Is Toggle CSS outline open source?: Toggle CSS outline has a public GitHub repository.

At a glance

Pricing: Free
Platforms: Web
Open source: Yes (GitHub)
Built for: web developers and CSS designers
Model: B2B
Solves: Seeing webpage element boundaries quickly while debugging CSS without opening browser developer tools.

Registered as

GitHub: theodejager/toggle-css-outline
Firefox Add-ons: toggle-css-outline

Developer

theodejager

Solo developer

GitHub

Open source

View on GitHub

Stars: 0
Forks: 0
Open issues: 0
Last commit: 14 Jul 2023
Commits 90d: 0
Contributors: 1
Authorship: Solo
Default branch: main
Latest release: 1.1 · 14 Jul 2023

Index record

Indexed: 12 Sep 2026
Lifecycle: Alive
Last seen: 12 Sep 2026

Identity audit (13)

Slug: toggle-css-outline-mozilla-org
Lifecycle state recorded: 12 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 12 Sep 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 12 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/toggle-css-outline

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