# Ruler

> Add a ruler below your mouse to help read long lines. Fired by ctrl+click

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

## Overview

- **ID:** `z-ruler`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Firefox user 13860642
- **Category:** other
- **Daily users:** 96
- **Weekly downloads:** 5
- **Rating:** 3.55 / 5 (11 ratings)
- **Version:** 1.2resigned1
- **Last updated:** 2024-04-25
- **First published:** 2018-03-14
- **Size:** 12 KB
- **Data as of:** 2026-09-12
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/z-ruler/)

## Description

**Ruler** is a Chrome extension designed to aid users in reading long lines on their screen by displaying a ruler directly beneath the mouse cursor. This intuitive tool is activated effortlessly with a simple ctrl+click, appearing only when needed and enhancing readability and precision. Whether you're reviewing code, reading extensive documents, or working with wide spreadsheets, Ruler helps maintain alignment without losing your place.

This lightweight extension focuses on improving your digital workspace ergonomics by providing an unobtrusive measurement aid that supports productivity and reduces eye strain. With no setup required, Ruler integrates seamlessly into your browsing experience, delivering an essential utility for professionals, students, and anyone who works extensively with text on their screen.

## Rankings

- #11,917 — Overall
- #19 — rule

## Permissions and access

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Low 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).

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- [Fixed Ruler Mode](https://chrome-stats.com/d/fixed-ruler-mode)
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Source: [Chrome-Stats](https://chrome-stats.com/d/z-ruler)