Around 2020, I think tools like Notion (notion.so) made it popular. Even the Huggingface itself is an emoji...
It does show up as the poop emoji followed by .la in google search results, but not in a firefox address bar.
That is by design (on Firefox's part) to avoid someone registering e.g. steаmpowered.com (notice а as U+0430 instead of a as U+61) and running a scam that looks valid on the address bar.