It's pretty crap in practice. Which of those icons am I to choose for HN? Dog? Fork and knife? Apple? Sunglasses? Briefcase? Gift?
I chose 'Dollars' as the closest fit due to the association between the tech industry and greed, but really shouldn't there be at least one tech-themed icon? Of the 12, two are food themed, two or three are shopping related, etc. The icon set is redundant with poor conceptual coverage.
Okay, maybe I'm a nerd who cares about tech and Mozilla thinks most firefox users who use Multi-Account Containers will be regular joes who aren't interested in tech. I disagree, but maybe that's their theory. What icon am I to use for youtube? Everybody uses youtube. Is youtube conceptually a briefcase? Trees? Dog? Is it a dog because everybody watches dog videos on youtube? I chose sunglasses, because sunglasses are associated with eyes and eyes are associated with videos.. it's a pretty tenuous association. And which color? Red makes sense, youtube brands itself with the color red. Yet red isn't on the color list. Two shades of orange are on the list, but not red. What the fuck? So youtube is "dark orange sunglasses". Great, just great.