I'm using Firefox as a browser. They haven't worked for a few hours..

i do find that this happens to me occasionally (i use firefox on macos) but restarting firefox generally resolves the issue; would that help at all? assuming you've not tried it already of course! the hovers are all working for me at the moment.

Have you tried clearing your browser's cache and restarting it?

Clearing my cache worked! Thank you both. :)

Awesome! I'll go ahead and lock this up. :)