# Highlight Opened Tabs

> Highlight opened tabs when hovering links and instantly show duplicates of the active tab, with a quick badge counter and adjustable hover delay. A lightweight tool for staying aware of already‑opened pages.

Canonical page: [https://chrome-stats.com/d/highlight-opened-tabs](https://chrome-stats.com/d/highlight-opened-tabs)

## Overview

- **ID:** `highlight-opened-tabs`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Kustrica
- **Category:** search-tools,tabs
- **Daily users:** 30
- **Weekly downloads:** 5
- **Rating:** 5.00 / 5 (2 ratings)
- **Version:** 1.9.5
- **Last updated:** 2026-07-30
- **First published:** 2026-02-14
- **Size:** 343 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/highlight-opened-tabs/)
- **Website:** [https://t.me/Kustric](https://t.me/Kustric)

## Description

<strong>Highlight Opened Tabs</strong> is a lightweight Firefox extension that helps you see which pages are already open. It highlights existing tabs when you hover a link on any page and highlights duplicates of the currently active tab, so you can avoid opening the same page twice.

<strong>Highlight opened tabs on hover</strong>
Hover any link on a webpage – tabs with the same URL are highlighted in your tab strip. The hover delay is configurable, and highlights can be cleared automatically when you leave the window/top panel.

<strong>Highlight duplicates of the active tab</strong>
When you switch or load a tab, all other tabs with the same normalized URL are highlighted. An optional badge counter shows how many duplicates are open.

<strong>Technical details</strong>
- Built on <strong>Manifest V3</strong>
- Uses a lightweight <strong>content script</strong> and event‑based background logic
- <strong>No data collection</strong>, tracking, or analytics

<strong>Localization</strong>
The extension is fully translated into <strong>19 languages</strong>, including:
English, Spanish, German, French, Russian, Belarusian, Chinese (Simplified and Traditional), Japanese, Portuguese, Italian, Korean, Polish, Dutch, Turkish, Ukrainian, Indonesian, Arabic, and Vietnamese.

## Rankings

- #20,321 — Overall
- #71 — highlighter
- #188 — badge
- #202 — openvpn
- #217 — openclaw
- #222 — delight

## Permissions and access

### Permissions

- `tabs`
- `storage`

### Host permissions

- `*://*/*`

### Content script matches

- `*`

## Safety

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

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- 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/highlight-opened-tabs)