fix: Firefox user-agent string reference (#39329)

* fix: Firefox user-agent string reference

Since Firefox 127.0 released, Linux x86 was reported as x86_64, add note for it.
Add notes for windows aarch64 cpu and remove outdated reference.

Signed-off-by: Coia Prant <[email protected]>

* Update files/en-us/web/http/reference/headers/user-agent/firefox/index.md

* Update files/en-us/web/http/reference/headers/user-agent/firefox/index.md

* Update files/en-us/web/http/reference/headers/user-agent/firefox/index.md

* Update files/en-us/web/http/reference/headers/user-agent/firefox/index.md

---------

Signed-off-by: Coia Prant <[email protected]>
Co-authored-by: Hamish Willee <[email protected]>

Author: rbqvq

files/en-us/web/http/reference/headers/user-agent/firefox/index.md

@@ -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
 
@@ -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.