First Party Isolation

Name: First Party Isolation
Rating: 4.1591 (44 reviews)
Author: freddyb

By: freddyb

This add-on enables the First Party isolation pref. Clicking the Fishbowl icon temporarily disables it.

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Features & Capabilities

The First Party Isolation Chrome extension enhances your online privacy by enabling the First Party Isolation feature. Inspired by the Tor Browser's privacy model, it keys all browser identifiers to the domain you visit, effectively isolating and blocking third-party trackers and cookies beyond standard blocking methods.

Users can easily toggle this privacy feature on or off by clicking the Fishbowl icon, disabling or enabling first-party isolation as needed. This add-on offers a comprehensive approach to safeguard against cross-site tracking and fingerprinting, making your browsing more secure and private.

User Growth & Download Statistics

Add-on Privacy & Security

By:

freddyb

Daily users:

1,385 -3

Rating:

4.16

(44)

Version:

1.4.0 Last updated: 2021-01-14

Version code:

5164451

Creation date:

2017-10-20

Risk:

Permissions:

privacy

Size:

109.46KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-03

Compare stats and ranking:

Ranking

# 2,723 ▼ 17

Other rankings

#36 in party keyword 39

For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

freddyb

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/first-party-isolation/

Website:

https://github.com/mozfreddyb/webext-firstpartyisolation/issues

User Reviews

Users appreciate this Firefox add-on for its straightforward ability to toggle First Party Isolation, enhancing browser privacy without manual config edits. However, multiple reviews mention the need to restart the add-on or browser when enabling FPI and compatibility problems with services like Apple iCloud. The lack of a whitelist feature limits flexible use. Additionally, Ubuntu users encounter functional issues, leading some to manually edit configuration files to manage isolation settings.

Pros

Provides easy toggling of First Party Isolation (FPI) settings.
Works as expected in isolating first-party data and enhancing privacy.
Simple to use compared to manual configuration via about:config or prefs.js.

Cons

Add-on requires browser or extension restart to enable FPI after disabling it.
Some compatibility issues with certain services like Apple iCloud, necessitating temporary deactivation.
Does not support a whitelist feature for exceptions, limiting usability in some scenarios.
Functionality issues reported on Ubuntu Linux, with the add-on not working properly after switching off.
Users resorting to manual preference edits due to add-on limitations.

Recent reviews

Extremely happy with this addon, and have used it successfully for many years in Firefox 😊 Apparently though, in modern Firefox, privacy.firstparty.isolate = false is the default because it is all handled automatically by other processes. However, in Mullvad browser, privacy.firstparty.isolate = true - is the default because they have a stricter configuration. So there is a distinction between these two Firefox-based browsers and how they deal with the privacy.firstparty.isolate issue.

by ha*****, 2025-11-22

by Fr*****, 2025-07-27

by 远离*****, 2025-03-26

View all user reviews ›

Is First Party Isolation 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.

First Party Isolation requires very minimum permissions.

Risk impact analysis details

High Can change privacy settings, which if misused, may compromise user privacy.

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.

First Party Isolation has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

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