What is Tumblr Container?

Tumblr Container focuses on preventing Tumblr from tracking browsing activity outside Tumblr. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use Tumblr Container?

Tumblr Container is an open-source project built for firefox users concerned about privacy and cross-site tracking.

Is Tumblr Container free?

Yes — Tumblr Container is free to use.

What platforms does Tumblr Container run on?

Tumblr Container runs on the web and embeddable surfaces.

Is Tumblr Container still maintained?

Unverified. Tumblr Container 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 Tumblr Container?

Similar projects tracked by PulseGate include Twitter Container, YouTube Container, and Facebook Container.

Who develops Tumblr Container?

Tumblr Container is developed by tsubamenarumi.

When did Tumblr Container launch?

Tumblr Container first shipped in 2019.

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Tumblr Container

Name: Tumblr Container
Author: tsubamenarumi

github.comBrowser DevTools & extensions

Tumblr Container is a Firefox browser extension that separates Tumblr activity from the rest of a user's browsing. It helps limit cross-site tracking by isolating Tumblr cookies and related browsing data in a dedicated container.

FreeWebEmbeddable

Visit github.com

Overview

5 features

Tumblr Container sits in PulseGate's Browser DevTools & extensions category. It focuses on preventing Tumblr from tracking browsing activity outside Tumblr. Tumblr Container is an open-source project aimed at firefox users concerned about privacy and cross-site tracking. Tumblr Container costs nothing to use. It ships for the web and embeddable surfaces.

tsubamenarumi builds and maintains Tumblr Container, and it first shipped in 2019. Key capabilities include site isolation, cookie separation, and cross-site tracking prevention.

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

Site isolation
Cookie separation
Cross-site tracking prevention
Dedicated container
Firefox integration

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed12 Sep · 23:00 UTC
Tumblr Container verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Tumblr Container

What is Tumblr Container?: Tumblr Container focuses on preventing Tumblr from tracking browsing activity outside Tumblr. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use Tumblr Container?: Tumblr Container is an open-source project built for firefox users concerned about privacy and cross-site tracking.
Is Tumblr Container free?: Yes — Tumblr Container is free to use.
What platforms does Tumblr Container run on?: Tumblr Container runs on the web and embeddable surfaces.
Is Tumblr Container still maintained?: Unverified. Tumblr Container 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 Tumblr Container?: Similar projects tracked by PulseGate include Twitter Container, YouTube Container, and Facebook Container.Twitter Container YouTube Container Facebook Container
Who develops Tumblr Container?: Tumblr Container is developed by tsubamenarumi.
When did Tumblr Container launch?: Tumblr Container first shipped in 2019.

At a glance

Pricing: Free
Platforms: Web
Languages: English
First seen: 12 Sep 2026
Built for: Firefox users concerned about privacy and cross-site tracking
Model: Open source
Solves: Preventing Tumblr from tracking browsing activity outside Tumblr.

Registered as

Firefox Add-ons: tumblr-container

Developer

tsubamenarumi

Index record

Indexed: 12 Sep 2026
Lifecycle: Alive
First seen: Sep 2026
Last seen: 12 Sep 2026

Identity audit (13)

Slug: tumblr-container-github-com
Lifecycle state recorded: 12 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 12 Sep 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Written by a language model from the project's public pages.
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: 12 Sep 2026
Canonical URL: https://github.com/tsubamenarumi/contain-tumblr

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