# ZeroWidth Detection

> Checks websites that you visit for invisible zero-width characters and replaces them with a specified character. Has the ability to copy all the characters found.

Canonical page: [https://chrome-stats.com/d/zerowidth-detection](https://chrome-stats.com/d/zerowidth-detection)

## Overview

- **ID:** `zerowidth-detection`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Mikkel D.
- **Category:** privacy-security
- **Daily users:** 23
- **Rating:** 5.00 / 5 (2 ratings)
- **Version:** 2.1resigned1
- **Last updated:** 2024-04-25
- **First published:** 2018-07-08
- **Size:** 18 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/zerowidth-detection/)
- **Website:** [https://github.com/mikkel1156/ZeroWidth-Detection-Firefox/issues](https://github.com/mikkel1156/ZeroWidth-Detection-Firefox/issues)

## Description

ZeroWidth Detection is a Firefox add-on that helps you detect and replace invisible zero-width characters used for online tracking. It allows you to manually scan pages, copy detected characters, and specify custom replacements. Whitelist trusted domains and check copied text for zero-width characters. Visit GitHub to contribute or access the source code.

## Rankings

- #22,982 — Overall
- #36 — detect
- #202 — section

## Permissions and access

### Permissions

- `<all_urls>`
- `tabs`
- `storage`
- `webRequest`
- `clipboardRead`
- `clipboardWrite`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High 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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Source: [Chrome-Stats](https://chrome-stats.com/d/zerowidth-detection)