Default Container Handler

Name: Default Container Handler
Author: Sarcastic Bird

Route all external links into a default Firefox container, with graceful handling when Zen Browser reassigns the tab to a different container based on its workspace rules.

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Features & Capabilities

Firefox Multi-Account Containers let you keep browsing contexts isolated, but external links (from other apps, Slack, email, etc.) open in whatever container the active workspace happens to be using. Zen Browser has no concept of a "default workspace," which makes this worse.

Default Container Handler fixes this by registering an ext+container: protocol handler. Paired with a URL rewriter like Finicky on macOS, every external link is opened in the container you designate as default (for example, "Personal"). If Zen's workspace rules then reassign the tab to a different container, the extension detects the reassignment and re-opens the link in the correct container, so focus follows the tab instead of flipping back.

Setup

Install the extension. When prompted, select Default Container Handler as the handler for ext+container: links. Configure Finicky (or any URL rewriter) to rewrite external links into the ext+container:name=<ContainerName>&url=<encoded-url> format. Full setup instructions and a sample Finicky config are on GitHub: https://github.com/sarcasticbird/default-container-handler

Privacy

This extension does not collect, store, or transmit any data. It only reads tab URLs long enough to route them to the correct container, and creates containers on demand when one doesn't exist.

User Growth & Download Statistics

Add-on

By:

Sarcastic Bird

Daily users:

Version:

1.0.1 Last updated: 2026-04-20

Version code:

6225498

Creation date:

2026-04-17

Risk:

Permissions:

contextualIdentities
cookies
tabs
webNavigation

Size:

11.00KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-03

Compare stats and ranking:

Ranking

# 133,131 ▲ 852

Other rankings

#133 in handle keyword 24 ▼ 3

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Contact the developer

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Developed by:

Sarcastic Bird

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/default-container-handler/

Website:

https://github.com/sarcasticbird/default-container-handler

Is Default Container Handler 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.

Default Container Handler requires a few sensitive permissions. 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.
High ****** ********* ** * ****** ******** ******** ********** * ******* ******* *****

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.

Default Container Handler is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

Risk likelihood analysis details

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