Can you post a link to a publicly accessible page (i.e. no authentication or signing on required) that shows this as this isn't exposed to websites via the user agent?

You Firefox UserAgent used to post this thread appears to be fine as it is 64-bit Windows. The NT 10.0 is the same on both Windows 10 and 11 as 11 is built on the same foundation as Windows 10.

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:125.0) Gecko/20100101 Firefox/125.0

If you use 32-bit windows then you still get the 'Win64; x64;' user agent. This also happens on Linux where you get Linux x86_64; with 32-bit Linux version.

• Mozilla/5.0 (X11; Linux x86_64; rv:125.0) Gecko/20100101 Firefox/125.0
• 1559747 - User-Agent string needn't reveal a user is running 32-bit Firefox on a 64-bit OS [69]

However at least I got the NT 10.0 part right as it will be same on Windows 10 and 11.

However I wonder why the OP thinks Firefox is being identified as if on 32-bit Windows?

If you use 32-bit windows then you still get the 'Win64; x64;' user agent.

• 1559747 - User-Agent string needn't reveal a user is running 32-bit Firefox on a 64-bit OS [69]

Ah right I forgot they made that change. NPAPI Plugins for example is not allowed to run anymore so the 32-bit/64-bit OS is not an issue now days for that. The 32-bit Linux distros are not as common now and also I guess the number of users who are still using ancient 32-bit CPU's in general is less and less as time goes on.