As a web developer i don't think i have ever supported this feature, but only because i never remembered to. It's a pretty easy feature to add, but unless browsers can force it, you're better off with uBLock.
No one (corporate) supports it unless it comes enabled by default with whatever compliance service/ plugin used on their sites.
The best combo I've found so far is Waterfox + uBO. I'm sure there are others, but this works well if you don't want to use a chromium based browser.