My tab hoarding has evolved a bit. I use separate windows that are mostly subject-based now. I might have an Amazon window that sticks around for several days that will explode with tabs before I decide to put in an order. If I get on a Factorio kick I end up with a window with dozens of blueprints and forum posts that will stay for a few months (until I get bored/overwhelmed with the game again...it's a cycle, that one...). I usually have a "main window" with stuff like email and nextdns allow list (stuff that I tend to fiddle with often) and a discord/reddit window. The wikipedia window comes and goes but sometimes gets several dozen tabs and might last a few days.

Always vertical tabs since forever. I feel like if I bookmark something I probably just missclicked at some point, it's just never been in my flow, even before tabs restoring on launch and automatic tab unloading.