This change fixes the problem by looking for an existing preferences dialog using the window mediator, and focusing one if found. Otherwise, a new one is loaded. Patch from jbetak@netscape.com based on my suggestion, r=dbaron, sr=myself. git-svn-id: svn://10.0.0.236/trunk@98437 18797224-902f-48f8-a5cc-f745e15eee43
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