[nvda] NVDA's find command in Firefox

There have been some comments stating that the NVDA find command can't be used. 
 This is not true.  If you are in Firefox and use the ctrl-f for the find 
dialog you'll need to type in your search word.  As of version R1642 the search 
is case sensitive.  Also, after you hit the OK button it takes you back to the 
NVDA startup screen.  If you use alt-tab you'll go back to FF and will be at 
the place where your word was found.  Also, the F3 repeat find works very well 
and leaves you in the right task.  

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