[eyelidlessness]

> This is just basically everyone using Slack, as Firefox, Chrome, and Safari support web extensions API

~Basically my point. I made allowances for people who use neither, but they’re a vanishingly small user share.

> I would bet that most people who use Chrome or Firefox install extensions that can run arbitrary JS on every page, like ad blockers, full page screenshot, or “nifty” discount-coupon-code extensions.

Pretty much my point. Along with the former point, the Venn diagram is roughly all Slack users.