I switched last week to Firefox after trying to go back to it over and over again, maybe once a year, for 5+ years. I absolutely love the Container system it has. I was fumbling around between Chrome profiles for GCP and back to my personal for gdrive/docs/etc. It just got cumbersome. I didn't really understand what the Containers were until I installed the extension and started to split up domains by Work and Personal containers. It's fantastic. Now I have a ton of work-only domains that as soon as I go to them it opens them automatically in my "Work" container. If I pop over to reddit or hn it automatically uses a "Personal" container. The UX could be better, I'd like to dump a list of sites in and bulk select their containers but you can't do that AFAIK. I'd also like to open a URL and just hit a checkbox that says "Always open this in Work/Personal" instead I need to open a Personal container and then "always open in this container."

Haven't really paid attention to resource usage vs chrome. I don't immediately feel like it's incredibly lower, if lower at all, but that's just taking a cursory glance that having a decent amount of static tabs and a video player running (not 1080p) is using 2gb of ram. I feel like chrome would be right there, maybe higher, like 3gb.

edit: Also, I found this which turns the entire thing into a dark mode (I use Dark reader as well) https://github.com/overdodactyl/ShadowFox

It's got some quirks that bug me. On Windows (I use OSX mostly) it seems to have issues with dragging links out but nothing to get me running away from it.