Tree-Style Tabs, uBlock Origin, Multi-Account Containers, Temporary Containers, and Containerise are the 5 "essential" addons I care about. If another browser could replicate the same functionality as those, I'd consider switching, but none of them yet can.
Chrome for the cases where something doesn't work in Firefox.
Firefox 77. It doesn't do the same thing as Temporary Containers + Containerise. DFPI isolates things based on the URL bar, prohibiting third-party storage. You can't have a whole group of sites use the same "container". So you can't get something like facebook.com + instagram.com +both using the same container (sharing cookies). AFAICT it's sort of like if you only had Temporary Containers, not permanent ones + temporary ones.