From other comments in this thread though it seems to be stuck on quite old versions of ESR though. Seems like it took until about September 2024 to go from a mid-2020 version (78) to a late-2021 version (91) according to this [1].
I don’t have any first-hand experience but from the comment that linked that blog, and the site itself, it’s not clear whether the browser engine has been updated since…
1. https://www.flypig.co.uk/?to=gecko&list_id=975&list=gecko