# Prism — Reading Focus Line

> A smooth horizontal focus band that follows your cursor — dims everything else so your eyes never lose the line.

Canonical page: [https://chrome-stats.com/d/prism-reading-focus-line](https://chrome-stats.com/d/prism-reading-focus-line)

## Overview

- **ID:** `prism-reading-focus-line`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Sandra
- **Category:** feeds-news-blogging
- **Daily users:** 2
- **Weekly downloads:** 1
- **Version:** 1.0
- **Last updated:** 2026-05-24
- **First published:** 2026-05-21
- **Size:** 23 KB
- **Data as of:** 2026-09-12
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/prism-reading-focus-line/)

## Description

Long articles, dense documentation, wide spreadsheets — your eyes drift. Prism solves it by dimming the entire page except a precise horizontal strip around your cursor, giving you a natural reading guide that moves with you.

No Reader Mode. No layout change. No page reload. It just works — on every website, instantly.

▸ HOW IT WORKS

Move your cursor over any page and Prism draws a focus strip at that exact position. Everything above and below fades back. Scroll, and the strip glides with your pointer as you read down the page.

Three settings, zero complexity:

🔲 Focus line height — Slim (tight single-line focus), Normal (comfortable), Wide (paragraph-width band)

🔆 Dim strength — Light (subtle tint), Medium (clear contrast), Strong (deep focus mode)

Toggle it off in one click whenever you don't need it.

→ IDEAL FOR

• Long research articles and blog posts

• Code documentation and API references

• Spreadsheets and data-heavy tables

• Any text where your eyes tend to wander

## Rankings

- #65,068 — Overall
- #102 — spreadsheet
- #107 — line
- #182 — focus
- #230 — cursors
- #236 — cursor

## Permissions and access

### Permissions

- `storage`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

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- [FocusBlind](https://chrome-stats.com/d/focusblind)
- [FocusRead](https://chrome-stats.com/d/focusread) — 6 users, 5.00 / 5
- [Spotlight Reader](https://chrome-stats.com/d/spotlightreader) — 1 users
- [FocusFlow: Smart Reader & Accessibility Toolkit](https://chrome-stats.com/d/focusflow-accessibilitytoolkit) — 2 users
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- [Zen Reader – ADHD & Focus Reading Engine](https://chrome-stats.com/d/zen-reader-focus) — 7 users, 4.00 / 5
- [Reading Mask](https://chrome-stats.com/d/reading-mask) — 9 users
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- [Quick Focus](https://chrome-stats.com/d/quick-focus21)
- [Focus Reader](https://chrome-stats.com/d/michie1-focus-reader) — 2 users
- [Cursor Reading Guide](https://chrome-stats.com/d/cursor-reading-guide) — 1 users

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Source: [Chrome-Stats](https://chrome-stats.com/d/prism-reading-focus-line)