# Reading Ruler Plug in

> Adds a reading ruler to the user's screen allowing easier reading of dense pages. Users can move their mouse and the ruler will follow. Users can control the width (completely) or height (to an extent).

Canonical page: [https://chrome-stats.com/d/reading-ruler-plug-in](https://chrome-stats.com/d/reading-ruler-plug-in)

## Overview

- **ID:** `reading-ruler-plug-in`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Noah Gartenberg
- **Category:** appearance,social-communication
- **Daily users:** 4
- **Version:** 1.0
- **Last updated:** 2024-09-28
- **First published:** 2024-09-27
- **Size:** 20 KB
- **Data as of:** 2026-09-11
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/reading-ruler-plug-in/)

## Description

Adds a reading ruler to the user's screen allowing easier reading of dense pages. Users can move their mouse and the ruler will follow. Users can control the width (completely) or height (to an extent), using the two sliders. 

If anything breaks in this Add-on, please let me know. This is the first Add-on I've ever made, so please be patient though.

## Rankings

- #48,587 — Overall
- #43 — plug
- #167 — rule
- #192 — trading

## Permissions and access

### Permissions

- `activeTab`

### Content script matches

- `<all_urls>`
- ``

## Safety

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

- [Reading Ruler](https://chrome-stats.com/d/reading-rulerrr)
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- [Reading Helper Ruler](https://chrome-stats.com/d/reading-helper-ruler) — 6 users
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- [Vertical Reading Ruler](https://chrome-stats.com/d/vertical-reading-ruler)
- [Ruler](https://chrome-stats.com/d/z-ruler) — 93 users, 3.55 / 5
- [BrowserOffice :: Web Rulers](https://chrome-stats.com/d/webrulers) — 29 users
- [Pixel Ruler Pro](https://chrome-stats.com/d/pixel-ruler-pro) — 10 users
- [Better Page Ruler](https://chrome-stats.com/d/better-page-ruler) — 35 users, 5.00 / 5
- [Page Ruler Plus](https://chrome-stats.com/d/page-ruler-plus) — 14 users

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Source: [Chrome-Stats](https://chrome-stats.com/d/reading-ruler-plug-in)