Link button in forums doesn't work

Clicking the button that should add [link] tags to a forum post doesn’t currently work in my browser. It just does nothing, nothing shows up in the chrome console.

Google Chrome is up to date

Version 75.0.3770.142 (Official Build) (64-bit)

I’m running uBlockOrigin but disabled it completely and reloaded and the same behavior occurred.

It should bring up a popup asking for a URL. I’m on Chrome 75 and that’s what I get, at least.

image

There’s some discussion from Chromium here, but nothing that should affect us. Any possibility that you have some sort of popup blocker that is inhibiting javascript prompt()s?