Earlier quoted context omitted.
There is: this one. Win95's UI was so incredibly influential that stuff introduced by it are still around to this day.
I don't really remember many Windows 95 firsts. One I remember is the ability to switch users without logging off. MacOS famously copied that (with a 3D cube look). I think they made something really revolutionary at the IE3 time. Their News and Mail app was an Explorer extension that placed an e-mail reader as the presentation of a folder full of folders of mailboxes and messages. You wouldn't see the extension, as…
Of course, working at an ISP I could also telnet to our NNTP server and read Usenet on the local filesystem. Ugh.