Who is Calendar Week for?

Calendar Week is a consumer product built for firefox users who need quick calendar-week information.

Does Calendar Week have a free plan?

Yes — Calendar Week is free to use.

What platforms does Calendar Week run on?

Calendar Week runs on the web, embeddable surfaces, Windows, macOS, and Linux.

Is Calendar Week still maintained?

Unverified. Calendar Week 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 projects are similar to Calendar Week?

Similar projects tracked by PulseGate include Current Week Number, Week number extension, and Google Calendar Gray Weekends.

Who makes Calendar Week?

Calendar Week is developed by Michael.

How long has Calendar Week been around?

Calendar Week first shipped in 2025.

Back to the index

Calendar Week

Name: Calendar Week
Author: Michael

mozilla.orgCalendars, reminders & holidays

Calendar Week is a Firefox browser extension that displays the current calendar week and a monthly overview. It is intended for individuals who want quick access to week-number and calendar information while browsing.

FreeWebEmbeddableWindowsmacOSLinux

Visit mozilla.org

1alternative

5features

2025since

Overview

5 features

In the Calendars, reminders & holidays space, Calendar Week takes a focused approach. It focuses on finding the current calendar week and checking a monthly calendar overview while browsing. Calendar Week is a consumer product aimed at firefox users who need quick calendar-week information. It is available for free. It ships for the web, embeddable surfaces, Windows, macOS, and Linux.

Behind Calendar Week is Michael, and it first shipped in 2025. Among its 5 catalogued features are current week display, monthly overview, and browser toolbar access. The interface is available in 32 languages, including Czech, German, and Greek.

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

Current week display
Monthly overview
Browser toolbar access
Calendar week numbers
Firefox integration

Built with & integrations

Runs on

BrowserEmbeddableWindowsmacOSLinux

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed13 Sep · 22:16 UTC
Kalenderwoche verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Calendar Week

What is Calendar Week?: Calendar Week focuses on finding the current calendar week and checking a monthly calendar overview while browsing. It is catalogued under Calendars, reminders & holidays on PulseGate.
Who is Calendar Week for?: Calendar Week is a consumer product built for firefox users who need quick calendar-week information.
Does Calendar Week have a free plan?: Yes — Calendar Week is free to use.
What platforms does Calendar Week run on?: Calendar Week runs on the web, embeddable surfaces, Windows, macOS, and Linux.
Is Calendar Week still maintained?: Unverified. Calendar Week 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 projects are similar to Calendar Week?: Similar projects tracked by PulseGate include Current Week Number, Week number extension, and Google Calendar Gray Weekends.Current Week Number Week number extension Google Calendar Gray Weekends
Who makes Calendar Week?: Calendar Week is developed by Michael.
How long has Calendar Week been around?: Calendar Week first shipped in 2025.

At a glance

Pricing: Free
Platforms: Web
Built for: Firefox users who need quick calendar-week information
Model: B2C
Solves: Finding the current calendar week and checking a monthly calendar overview while browsing.

Registered as

Firefox Add-ons: kalenderwoche

Developer

Michael

Index record

Indexed: 13 Sep 2026
Lifecycle: Alive
Last seen: 13 Sep 2026

Identity audit (13)

Slug: kalenderwoche-mozilla-org
Lifecycle state recorded: 13 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 13 Sep 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
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: 13 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/kalenderwoche

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