Tab Flag focuses on finding unread or unvisited browser tabs quickly. It is catalogued under Browser DevTools & extensions on PulseGate.

Tab Flag is a consumer product built for firefox users managing many open tabs.

Does Tab Flag have a free plan?

Yes — Tab Flag is free to use.

Is Tab Flag still maintained?

Unverified. Tab Flag has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What are alternatives to Tab Flag?

Similar projects tracked by PulseGate include Tab Sorter, Tab Disguiser, and Tab Colors.

Who develops Tab Flag?

Tab Flag is developed by EffPeh.

How long has Tab Flag been around?

Tab Flag first shipped in 2018.

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Tab Flag

Name: Tab Flag
Author: EffPeh

mozilla.orgBrowser DevTools & extensions

Tab Flag is a Firefox extension that prefixes tab titles with user-selected characters or symbols to identify unread and unvisited pages. It helps Firefox users locate tabs that still need attention when managing multiple open pages.

FreeWebEmbeddablemacOSWindowsLinux

Visit mozilla.org

Overview

5 features

Tab Flag is a Browser DevTools & extensions project. It focuses on finding unread or unvisited browser tabs quickly. Tab Flag is a consumer product aimed at firefox users managing many open tabs. Tab Flag costs nothing to use. It runs on the web, embeddable surfaces, macOS, Windows, and Linux.

Behind Tab Flag is EffPeh, and it first shipped in 2018. Key capabilities include unread tab marking, unvisited tab marking, and custom title prefixes. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

Unread tab marking
Unvisited tab marking
Custom title prefixes
Custom symbols
Tab title updates

Built with & integrations

Runs on

BrowserEmbeddablemacOSWindowsLinux

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed10 Sep · 22:07 UTC
Tab Flag verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Tab Flag

What is Tab Flag?: Tab Flag focuses on finding unread or unvisited browser tabs quickly. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Tab Flag for?: Tab Flag is a consumer product built for firefox users managing many open tabs.
Does Tab Flag have a free plan?: Yes — Tab Flag is free to use.
What platforms does Tab Flag run on?: Tab Flag runs on the web, embeddable surfaces, macOS, Windows, and Linux.
Is Tab Flag still maintained?: Unverified. Tab Flag has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What are alternatives to Tab Flag?: Similar projects tracked by PulseGate include Tab Sorter, Tab Disguiser, and Tab Colors.Tab Sorter Tab Disguiser Tab Colors
Who develops Tab Flag?: Tab Flag is developed by EffPeh.
How long has Tab Flag been around?: Tab Flag first shipped in 2018.

At a glance

Pricing: Free
Platforms: Web
First seen: 10 Sep 2026
Built for: Firefox users managing many open tabs
Model: B2C
Solves: Finding unread or unvisited browser tabs quickly.

Registered as

Firefox Add-ons: tab-flag

Developer

EffPeh

Index record

Indexed: 10 Sep 2026
Lifecycle: Alive
First seen: Sep 2026
Last seen: 10 Sep 2026

Identity audit (13)

Slug: tab-flag-mozilla-org
Lifecycle state recorded: 10 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 10 Sep 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 10 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/tab-flag

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