Ɣef usiɣzef agi

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/

Iwenniten n uneflay

Limitation: the add-on does not modify the data about the OS that is exposed by Flash or Java (if you have one or both of them installed and enabled); while most sites probably don't use Flash or Java specifically for determining a user's OS, it is quite possible that some do.

Since 18.0t17.0.2 release, Windows (such as Vista or XP) installations are blended in by default as well (since 73.0.1 as Windows 10).

Pre-v57.0 Info:
Modifications made by the addon are logged in the Error Console (as well as dumped to the regular console).

If the add-on is disabled or uninstalled, all modified settings are restored by the add-on to their original values.

Sezmel tarmit-ik

Tizmilin n tuffɣa n 80.0.1autoversioning

* Update for Firefox 80.0.1+

- Now using auto-versioning: i.e., the version of the app will be unchanged (this is OK, since, with contributions from this addon's author, geckoTrail, & buildID no longer change for each release (i.e., version reflects the version installed; buildID, & geckoTrail reflect their "frozen" values))
-- So from now on, only platform, system & appVersion will be "Windows 10ified" (made appear as if the app was running on Windows 10)
- Platform value reflects the value resulting on most installations from automatic Firefox updates: Win32

Ittwaqdec sɣur