They had a couple big blunders with the ugly border/expansion when clicking the address bar, and "Ctrl+Tab cycles through tabs in recently used order".. both of these things should have never been the default (or at least we should've been given the option to select a default when they were first added, similar to what they did with the new color theme support), but besides that then I can't think of anything terrible and always happy to see new updates.
I would especially love to see deeper integration with their Multi-Account Containers add-on, e.g. allow us to tell a bookmark to open in X container, or allow us to always open X container based on URL path instead of just domain name.
I would especially love to see deeper integration with their Multi-Account Containers add-on, e.g. allow us to tell a bookmark to open in X container, or allow us to always open X container based on URL path instead of just domain name.