Safari is fairly conservative in de-prefixing new features, but also sometimes beats Firefox (e.g. Container Queries and Container Query Units).
For reference, here's the caniuse.com list of Safari CSS features which need prefixing, compared to Firefox: https://caniuse.com/?compare=safari+16.1,firefox+107,ios_saf...
In the link posted by the sibling commenter, I see 2-3 properties that could be useful to the general public. The rest is esoteric, never-ratified, or straight up user hostile (font-smooth)
I don't know if anybody really does other directions of that, though. There was probably no percentage in working with -moz prefixes for other browsers by the time this became an idea to do.
Mozilla/5.0 (Linux; Android 12; Pixel 6 Build/SD1A.210817.023; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/94.0.4606.71 Mobile Safari/537.36
Devs were NOT supposed to use prefixes in production, but they did anyway (best viewed in Chrome). Unfortunately they then proceeded to NEVER UPDATE these as other browsers added support. Non-webkit browsers had the choice of interpreting the CSS or leaving their users with a broken experience.
Major browsers moved away from vendor prefixes between 2012 and 2016 (when webkit finally stopped), but it was too late. Browsers 50 years from now will still be supporting this garbage because of what devs did.
The key takeaway: Never give devs a tool you don't want to be stuck with forever. Also, can we please not do this yet again in the future?
That's right. You can pry the <layer> element out of my cold, dead, hands.