I’ve had a problem where I was trying to display an Emoji in a Chrome Extension header of default popup HTML,
page_action.html (specified by
page_action -> default_popup in
But got the jumbled up characters instead.
The problem was that I had to instruct Chrome that I am using a unicode by adding a charset meta tag.
This has fixed the issue and shows the cute 🐥 emoji correctly in the Chrome Extension popup.