xulrunner and firefox 21.0

  nspr      4.9.6
  xulrunner  21.0
  firefox    21.0

are updated for 21.0, All are in wip now.
The thins I did were really simple part.

The harder one's are waiting.
  (1) fix (xulrunner) patch-python... 
  (2) Make firefox to work.

I don't have much time for now. Please play with them.

Thanks a lot,
---
Makoto Fujiwara, 
Chiba, Japan, Narita Airport and Disneyland prefecture.

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