[archb]

I decided to test it out on a website[0] and it does seem that the useragent goes by the Firefox name:

Mozilla/5.0 (Windows NT 10.0; rv:102.0) Gecko/20100101 Firefox/102.0

On my Firefox:

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/110.0

It's interesting to note that the Mullvad browser seems to be based off on Firefox 102.0, which came way back on June 28, 2022:

https://www.mozilla.org/en-US/firefox/102.0/releasenotes/

[0]: https://gs.statcounter.com/detect

[daveoc64]

Firefox 102 is current Extended Support Release (ESR):

https://www.mozilla.org/en-US/firefox/102.9.0/releasenotes/

[xeeeeeeeeeeenu]

You can see in the "About" window that it's based on Firefox 102.9, which is the latest ESR version. It masks the minor version in the UA string.

[doodlesdev]

That's because it's a fork of the Tor browser, meaning it's based on Firefox ESR, which is currently on version 102.

[input_sh]

Extended releases are counted a bit differently, it will jump from 102 to 115.