Attached is an image of the issue. I've looked around online and found people with similar issues, though not that exact fault. At first I was concerned about viruses but I've run multiple virus scans of my computer and there's no other signs I'd associate with one, so I assume it's another variation on that problem. It happens randomly, no specific triggers I can think of. I use three Firefox profiles, and it's happened on two of them. A ton of search results (the attached is just one example, the top results of reddit had this as well) will have seemingly random words replaced like this. This also occured on a page in my university's website. When I try to copy these, they copy as their original words and not the weird symbols. I'm very confused, basically. It doesn't go away on reload, ctrl+shift+r, or cache clearing, but closing and reopening the tab fixes it.