Blend In

Name: Blend In
Rating: 4.4 (10 reviews)
Author: Reşat

Blends in OS-related values in User-Agent HTTP request header & a number of JS properties, so that Firefox (Thunderbird) appears to sites visited as running on the OS being used the most in the world. Thunderbird can also be blended in as Firefox.

Overview

Firefox Add-ons Store

Daily users

59 ▼ 4

Data as of 2026-07-26

Rating:

4.40

(10)

Version:

80.0.1autoversioning

Last updated: 2020-09-08

Features & Capabilities

Blendin' In as:

OS: Windows 10 (since 73.0.1), so the add-on ensures that sites visited see values that are the same as those on Windows 10 (which lately had become the OS used the most in the world). E.g., Windows 8 as Windows 10, or Linux as Windows 10, etc.
Architecture: Win32 (since 73.0.1 (to match default values in mozilla firefox installations)) (was Win64 (for a while since 57.0)).
App: optionally, Thunderbird as Firefox (by toggling extensions.tildebirlik.privacy.blend-in.messenger.thunderfoxing in about:config (since 38.0.1t31.7.0 until 55.0.3t52.3.0); restarting not required since 43.0t38.4.0)

These features are meant to lower fingerprintability, & improve privacy.

Blendin' these In: The following fields are made the same as on a Firefox (Thunderbird) running on Windows 10 (Win64) (can be viewed locally by clicking on addon icon):

User-Agent HTTP header.
JS properties: 2.1. navigator.userAgent 2.2. navigator.appVersion 2.3. navigator.oscpu 2.4. navigator.platform 2.5. navigator.buildID

Blendin' In in:

crh-UA (QIRIMTATARCA (Kırım Tatarca))
en-US (English)
fr-FR (Français)
tr-TR (Türkçe)

Blendin' In for:

All OSs
All locales

Other Blendin' releases: Are available from here: https://addons.mozilla.org/en-US/firefox/addon/blend-in/versions/

User Growth & Download Statistics

Add-on

By:

Reşat

Daily users:

59 -4

Rating:

4.40

(10)

Version:

80.0.1autoversioning Last updated: 2020-09-08

Version code:

5094894

Creation date:

2011-04-23

Risk:

Permissions:

Content scripts matches:

<all_urls>

Size:

80.65KB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-26

Compare stats and ranking:

Ranking

# 14,459 ▼ 436

Other rankings

#99 in property keyword 18 #120 in value keyword 18 ▼ 4

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:

Reşat

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/blend-in/

User Reviews

by 远离*****, 2025-03-23

by 退出*****, 2025-02-24

View all user reviews ›

Is Blend In 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.

Blend In requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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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.

Blend In 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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