This extension uses Dietrich Ayala's Awesomebar library for the Add-on SDK to allow you to instantly look up a bug in Bugzilla given its bug ID number. The uses Bugzilla's REST API to do the actual bug data lookup.
As an example, type the following into the Awesomebar:
and it will show the following as the result
Bug 90000: VERIFIED:DUPLICATE - quicksearch from bugzilla main page does not work with IE 6.0
Clicking it will load that bug's Bugzilla entry.
Awesomebar library: http://autonome.wordpress.com/2011/06/08/extensibly-awesome/
BZ REST API: https://wiki.mozilla.org/Bugzilla:REST_API