[Bug 677551]

[Mats Palmgren]

After thinking some more about that assertion; it's probably not a typo
but intended to catch an empty first-letter frame that should have been
removed (as in bug 578977).  So let's keep it.

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https://bugs.launchpad.net/bugs/677551

Title:
  pressing Enter in a large textarea is very CPU intensive with Firefox
  4.0