I have a website that I frequent, and when I would hover my cursor over a heading within that site, a selection of destinations would display. However, that capability has disappeared, suggestions?

I have a website that I frequent, and when I would hover my cursor over a heading within that site, a selection of destinations would display. However, that capability has disappeared sometime during the last few upgrades to Firefox. However, I am still able to use that feature in Chrome and Edge, any suggestions? Thank you.