I'd like to see Containers have their own primary color scheme (customizable), and perhaps on-tab indicator that the tab is a container (not just the URL bar).
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For the on-tab indicator, there should be a thin color line along the top of the tab or above the tab (before Firefox 89, it was along the bottom of the tab). It certainly can be hard to see on a maximized window where it is nearly up against the top of the screen.
When using Multi-Account Containers, we/all should have a greater control over Color selection(s) for each container, as well as greater Icon selection's than what is presently granted as default.
Would love more colours. Eight is not enough for me, so more control would be nice. I'm pretty sure there used to be even more colours before and they were removed 😞
Multi-Account Containers colors and icons
I am a heavy user of Multi-Account Containers and I consider it one of the killer features of Firefox. However the amount of colors and icons available for customization is quite limited and has been so for a long time. Please, give us more colors and more icons to make our containers more unique and more easily recognizable.
(Note: a similar idea has been merged into this thread)