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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.

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):

1. User-Agent HTTP header.
2. 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/