Although I do enjoy using it, I have not been able to find a workaround for the incompatibility of it with Firefox 3. It doesn't matter what key/key combination you set to invoke KeyCue, when Firefox is the frontmost application & you try to invoke KeyCue, Firefox will crash.
I also use Google's new Quick Search Bar (http://code.google.com/p/qsb-mac/) & it's invoked by pressing the 'Command'-key twice but it doesn't cause Firefox to crash.
Other users have reported the same problem with KeyCue on Mozilla's support page. I hope KeyCue's developer will have a fix for this soon.
KeyCue
Display list of currently available menu shortcuts by holding down a command key.
Version: 4.5
Version 4.3 incompatible with Firefox 3
Feedback Type: Troubleshooting Report
Contributed by: etherl Monday, March 02 2009 @ 07:31 AM PST
Product Platform: MacOSX
Used Product For: 1-6 months
System Info:
Version 4.3 incompatible with Firefox 3 - byrnegreen
I finally figured this out AFTER reinstalling my whole FF setup after it appeared to have become unstable. Then, when it persisted, I traced it back to KeyCue . Responding to this thread in hopes that future Googlers can find this crash culprit: <b> Key Cue makes Firefox 3 Unstable!Reply to This
Sunday, May 03 2009 @ 01:17 PM PDT