TIL that the last version of NCSA Mosaic, with juuuust a few modifications, is available as a Flatpak, 1996-era UI widgets and all.
https://flathub.org/apps/com.github.fries1234.ncsa-mosaic
The Github project also has directions on building on Arch and Ubuntu.
Unfortunately, modern TLS and SNI aren't supported, so #Mosaic can't connect to a lot of websites, but it's still a fun look back at a piece of #WebHistory !