Earlier quoted context omitted.
I use Chrome as my only browser. On my desktop, I run an average of 20 tabs open at any given time, across two windows. I also run Chrome on my Android phone (Samsung Galaxy Note 3) and keep 4--8 tabs open at any given time. I reboot my desktop once every 1--2 weeks, and my phone maybe once per month. Other than the rare tab freezing up and needing to be restarted, I've had absolutely no issues. Chrome just works.
Our workflow sounds similar, except that when my system reboots, Chrome is frozen for a minute as every tab tries to reload simultaneously, following by confusion as any youtube tabs all start playing. On Firefox I had no such issue as each tab would only reload on focus.
[digs into settings] Ah, that's it: on Settings > On Startup, I've selected "Open The New Tab Page" which (I think) is the default.
Yeah, trying to open up a couple dozen tabs at once, several of which are videos, could be problematic.