Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.4; en-US; rv:1.9b4) Gecko/2008030317 Firefox/3.0b4
Steps to reproduce :
* go to https://bugzilla.mozilla.org
* click on the bug icon left to the location bar
* a nice dialog pop up with a button
clicking or trying to click on the button as no effect.
on the other hand while the panel is showing pressing the space bar will open the page information dialog.
*** This bug has been marked as a duplicate of bug 415704 ***