indeed! had I not posted this, I would be asking the same question!
so, its quite a bit more mundane than you might have hoped for.
a mix of...
~40% locally served internal pages (mostly zabbix, mail/web server monitoring, some development pages, etc).
~60% non-local pages - currently lots of retro computing stuff, debian stuff, github (sigh)
the most recent page I opened was an archive.org page on TI-84 firmware disassembly.
I make heavy use of Firefox containers for separation. honestly, Firefox is an absolute workhorse for me. if the Firefox ecosystem were to fall into the void, I would be dead in the water.