Yes, it turns out I can see this in Firefox as well, now that I've found a modal dialog with a menulist. Here's a screen cast. Each time the cursor pauses for a bit I'm trying to click there and nothing happens.
Bug 1906224 Comment 7 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Yes, it turns out I can see this in Firefox as well, now that I've found a modal dialog with a menulist. Here's a screen cast. Each time the cursor pauses for a bit I'm trying to click there and nothing happens. (Including on the menulist dropmarker.)