what does this even mean???, I remember using firefox on windows xp back then, the reason they stop make a release version for windows xp because its too old and people already move on to newer windows 7 (microsoft already stop supporting it)
Are you telling me Windows XP is out of support? When did this happen?! :-D
But to answer your question seriously. Is a river today the same it was before? Is Firefox today the same it was when XP roamed the Earth with the dinosaurs?
The answer is, no, and yes, some of it. So it's a cheeky way to point out that someone managed to get Firefox running on a presumably very different OS HaikuOS, before getting it to run on Windows XP, which arguably must be pretty similar to say, Windows 10, when it comes to Win32 APIs.
(But of course, also Windows 10 is a slightly different river to the Windows XP creek.)
Its not that easy. Win32 API is not static, in evolves. While yes, it can provide great backward compat, new stuff is introduced ever new OS release (or Win10 update), so its pretty much easy to destroy portability to older version. To keep portability, you must target lowest API version you want, and keep it using like this.
Windows XP machines should not be connected to a network because they no longer receive security patches. They will get hacked if they are connected to a network (and please remember that not every piece of malware is obvious, some malware is stealthy, and just steal information from the hacked machine).
Also, you connect a machine which can be hacked, you are not just hurting yourself. That machine can be used for a lot of malicious purposes including DDOS attacks, sending SPAM, allowing attackers to hide their true location, etc.
Nostalgia is a powerful thing :) I have that for Windows 95 and 98. During the XP era I was mostly using Linux, though I did use xp for gaming every now and then.
And Retrozilla with the MSFN hacks to state TLS 1.3 at about:config
Altough with Gopher and gopher://magical.fish (and invidious instances plus Gopher services to search in Youtube and such) most of the web modulo complex logged sites can be avoided if the user wants to read some news without bogging down its machine.
Even http://portal.mozz.us works well against Gemini services such as gemini://gemi.dev to read Ars Technica, The Register, most newspapers...
No videos, but you can read the articles and see the images.
Pretty cool for a Pentium 2 for instance.
Anyway, Synchro.net with some NNTP client against FIDO/Dove and the actual Usenet will give and XP user far better talks on retro and current news.
Also, old IRC clients can connect to http://bitlbee.org against public servers and use current protocols such as Discord and modern IRC (TLS) and Jabber, among others.
(If you need a modern browser on XP, in the meantime try the Chrome port:
https://win32subsystem.live/supermium/ )