Browser Extension

The Angstroma browser extension brings accessibility features to every website a user visits — not just sites that have the widget installed. It's built with Manifest V3 and available for Chrome and Edge.

What it does

The extension uses the same feature engine as the widget SDK. When a user enables a feature, it is applied to the active page via a content script. Settings sync across sessions using the user's Angstroma profile.

Features

Reading Mask
Bionic Reading
Dyslexia Font
Text Spacing
High Contrast
Dark Mode
Warm Overlay
Large Text (A+/A-)
Large Cursor
Large Targets
Focus Highlight
Keyboard Mode
Reduced Motion
Text-to-Speech

Components

Component	Description
Content script	Injected into every page — applies accessibility CSS and DOM changes
Service worker	Handles extension lifecycle, message routing, and profile sync
Popup	Quick-access toolbar from the browser action button — ephemeral
Side panel	Persistent accessibility panel (Chrome 114+ Side Panel API) — stays open across tab navigation

Installation

The extension is available from the Angstroma Portal under Settings → Extensions. Enterprise customers can deploy it via Chrome Enterprise policy for managed device fleets.

Permissions

The extension requests the following permissions:

Permission	Why
activeTab	Apply accessibility features to the current tab
scripting	Inject the content script into pages
storage	Cache settings locally for instant apply on page load
sidePanel	Open the persistent side panel UI (Chrome 114+)

Profile sync

If a user is signed into the Angstroma Portal, the extension syncs their profile using the standard X-Api-Key authentication. Features enabled in the extension are reflected in portal analytics and can be configured by administrators from the portal.

Note

Profile sync requires the user's API key to be configured in the extension settings. Enterprise deployments can pre-configure this via Chrome policy.

Enterprise deployment

Enterprise plans include silent deployment support via Chrome Enterprise and Microsoft Intune. The extension can be force-installed across managed device fleets with a pre-configured API key so students never need to sign in manually. Contact [email protected] for a deployment guide.