The Mozilla page says this fixes some "minor security holes".
It also breaks Galeon and Epiphany, and new versions of these have
still not appeared. In light of this, I think it's time to remove
these Gecko-based browsers. The future is going to be Firefox and
Thunderbird anyway, and I don't believe Galeon and Epiphany can be
compiled against Firefox's libraries.
а по-моему трезво дядька мыслит...