I use Firefox on my Nexus 4 for visiting meta. and other instances.
Since the changes from “the end of clown vomit” i think, there is no text on category badges when you are reading on firefox, mobile view.
I though it was only on Android but you can test it on a Firefox window in a desktop device too: Discourse Meta
- This is meta, with bars (Firefox on Mac):
- This is the instance of my organization, updated minutes ago, with boxes (Firefox on Ubuntu):