I had noticed that this transition looked a little wonky, but I wasn't quite sure what was wrong. I've caught it a couple times in really bad ways in the past few days. The first time, I was running under valgrind (read: slow) and I saw it occur in slow motion. Later on, I managed to get my fast macbook wedged in this state for 5 seconds or so while waking up from sleep. Here is a slow motion rendition: http://www.youtube.com/watch?v=sNF_qoJkI_E I get a blue highlight bar with no text drawn. At realtime speed, it just looks jittery and broken.

I'm pretty sure what is happening here is that the URL focused by command-L is supposed fade in while the hover text fades out. However, there's an interim state where the focused URL has not yet faded in, but the text highlight is drawn. This leaves an empty blue rectangle in my screencast. I think this state lasts rather longer than we would like on actual computers.

Yeah, this is a problem. The patch in bug 597581 fixes this. Hopefully Dao will review it soon... Requesting blocking (final) because we shouldn't ship Firefox 4 like this.

Fixed by bug 597581. Cmd+L while a link target is shown causes the link target to disappear immediately and the current URL to appear immediately.