What does Calendar do?

Calendar focuses on viewing a calendar in Firefox without leaving the browser. It is catalogued under Calendars, reminders & holidays on PulseGate.

Who should use Calendar?

Calendar is a consumer product built for firefox users who need a lightweight calendar.

Does Calendar have a free plan?

Yes — Calendar is free to use.

What platforms does Calendar run on?

Calendar runs on the web and embeddable surfaces.

Is Calendar still active?

Unverified. Calendar 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 Calendar?

Similar projects tracked by PulseGate include Simple Calendar, Calendar Extension for Google Calendar™, and Outlook Calendar button.

Who develops Calendar?

Calendar is developed by Bennet.

When did Calendar launch?

Calendar first shipped in 2025.

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Calendar

Name: Calendar
Author: Bennet

mozilla.orgCalendars, reminders & holidays

Calendar is a lightweight Firefox browser extension that opens or activates a pinned calendar tab from a toolbar button or keyboard shortcut. It is intended for Firefox users who want quick calendar access while browsing.

FreeWebEmbeddable

Visit mozilla.org

Overview

5 features

Calendar is a Calendars, reminders & holidays project. It focuses on viewing a calendar in Firefox without leaving the browser. It is built as a consumer product for firefox users who need a lightweight calendar. Calendar costs nothing to use. Calendar is available on the web and embeddable surfaces.

Behind Calendar is Bennet, and it first shipped in 2025. Among its 5 catalogued features are pinned calendar tab, toolbar button, and keyboard shortcut. The interface is available in 32 languages, including Czech, German, and Greek.

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

Pinned calendar tab
Toolbar button
Keyboard shortcut
Tab activation
Previous tab return

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed11 Sep · 14:17 UTC
Calendar verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Calendar

What does Calendar do?: Calendar focuses on viewing a calendar in Firefox without leaving the browser. It is catalogued under Calendars, reminders & holidays on PulseGate.
Who should use Calendar?: Calendar is a consumer product built for firefox users who need a lightweight calendar.
Does Calendar have a free plan?: Yes — Calendar is free to use.
What platforms does Calendar run on?: Calendar runs on the web and embeddable surfaces.
Is Calendar still active?: Unverified. Calendar 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 Calendar?: Similar projects tracked by PulseGate include Simple Calendar, Calendar Extension for Google Calendar™, and Outlook Calendar button.Simple Calendar Calendar Extension for Google Calendar™Outlook Calendar button
Who develops Calendar?: Calendar is developed by Bennet.
When did Calendar launch?: Calendar first shipped in 2025.

At a glance

Pricing: Free
Platforms: Web
Built for: Firefox users who need a lightweight calendar
Model: B2C
Solves: Viewing a calendar in Firefox without leaving the browser.

Registered as

Firefox Add-ons: calendar-sp

Developer

Bennet

Index record

Indexed: 11 Sep 2026
Lifecycle: Alive
Last seen: 11 Sep 2026

Identity audit (13)

Slug: calendar-mozilla-org
Lifecycle state recorded: 11 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 11 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: 11 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/calendar-sp

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