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fix: Firefox user-agent string reference #39329

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merged 5 commits into from
May 2, 2025
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fix: Firefox user-agent string reference #39329

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fix: Firefox user-agent string reference
rbqvq Apr 29, 2025
4202b2e
Update files/en-us/web/http/reference/headers/user-agent/firefox/inde…
hamishwillee May 2, 2025
399d8af
Update files/en-us/web/http/reference/headers/user-agent/firefox/inde…
hamishwillee May 2, 2025
bdb37c7
Update files/en-us/web/http/reference/headers/user-agent/firefox/inde…
hamishwillee May 2, 2025
9889839
Update files/en-us/web/http/reference/headers/user-agent/firefox/inde…
hamishwillee May 2, 2025
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15 changes: 11 additions & 4 deletions files/en-us/web/http/reference/headers/user-agent/firefox/index.md
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Expand Up @@ -55,10 +55,14 @@ The preferred way to target content to a device form factor is to use CSS Media

Windows user agents have the following variations, where _x.y_ is the Windows NT version (for instance, Windows NT 6.1).

| Windows version | Gecko user agent string |
| -------------------------------- | --------------------------------------------------------------------------------- |
| Windows NT on x86 or aarch64 CPU | Mozilla/5.0 (Windows NT _x_._y_; rv:10.0) Gecko/20100101 Firefox/10.0 |
| Windows NT on x64 CPU | Mozilla/5.0 (Windows NT _x_._y_; Win64; x64; rv:10.0) Gecko/20100101 Firefox/10.0 |
| Windows version | Gecko user agent string |
| --------------------- | --------------------------------------------------------------------------------- |
| Windows NT on x86 CPU | Mozilla/5.0 (Windows NT _x_._y_; rv:10.0) Gecko/20100101 Firefox/10.0 |
| Windows NT on x64 CPU | Mozilla/5.0 (Windows NT _x_._y_; Win64; x64; rv:10.0) Gecko/20100101 Firefox/10.0 |

> [!NOTE]
> An aarch64 CPU is reported as x86_64 on Windows 11, and x86 on Windows 10 (since it doesn't support x64 emulation).
> See [Bugzilla #1763310](https://bugzil.la/1763310).

## macOS

Expand All @@ -78,6 +82,9 @@ Linux is a more diverse platform. Your distribution of Linux might include an ex
| Linux desktop on i686 CPU | Mozilla/5.0 (X11; Linux i686; rv:10.0) Gecko/20100101 Firefox/10.0 |
| Linux desktop on x86_64 CPU | Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20100101 Firefox/10.0 |

> [!NOTE]
> In Firefox 127.0 and later, 32-bit x86 will now be reported as x86_64 in Firefox's User-Agent string,{{domxref("navigator.platform")}}, and {{domxref("navigator.oscpu")}} (see [Firefox 127.0 Release Notes](https://www.mozilla.org/en-US/firefox/127.0/releasenotes/)).

## Firefox for Android

Firefox for Android contains the Android version as part of the _platform_ token. For increased interoperability, if the browser is running on a version below 4 it will report 4.4. Android versions 4 and above report the version accurately. Note that the same Gecko—with the same capabilities—is shipped to all versions of Android.
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