Highlight Opened Tabs

Name: Highlight Opened Tabs
Author: Kustrica

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.

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Features & Capabilities

Highlight Opened Tabs 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.

Highlight opened tabs on hover 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.

Highlight duplicates of the active tab 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.

Technical details

Built on Manifest V3
Uses a lightweight content script and event‑based background logic
No data collection, tracking, or analytics

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

User Growth & Download Statistics

Add-on

By:

Kustrica

Daily users:

5 1

Version:

1.2 Last updated: 2026-03-04

Version code:

6169824

Creation date:

2026-02-14

Risk:

Permissions:

Host permissions:

<all_urls>

Content scripts matches:

<all_urls>

Size:

275.46KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-17

Compare stats and ranking:

Ranking

# 43,426 ▲ 4,018

Other rankings

#143 in highlighter keyword 51 ▲ 10

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Kustrica

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/highlight-opened-tabs/

Website:

https://t.me/Kustric

Is Highlight Opened Tabs Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Highlight Opened Tabs requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Highlight Opened Tabs may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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