# Vertical Reading Ruler

> Add a vertical ruler for column-based reading.

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

## Overview

- **ID:** `vertical-reading-ruler`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Removed
- **Publisher:** qh88
- **Version:** 1.0
- **Last updated:** 2025-12-25
- **First published:** 2025-12-22
- **Size:** 12 KB
- **Data as of:** 2026-05-13
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/vertical-reading-ruler/)

## Description

Vertical Reading Ruler overlays a vertical band that follows your cursor horizontally, helping with table or spreadsheet reading.

## Permissions and access

### Permissions

- `storage`
- `activeTab`
- `scripting`

### 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 is not longer available in the store

> 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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- [Multi-Ruler Mode](https://chrome-stats.com/d/multi-ruler-mode)
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Source: [Chrome-Stats](https://chrome-stats.com/d/vertical-reading-ruler)