The best browser out there just became better.
Versions 188.8.131.52 for the Firefox 2 branch and 184.108.40.206 for the Firefox 1.5 branch are out. Update now!
And some news floating around says that 220.127.116.11 and 18.104.22.168 won’t be long either.
You may find a way to update Firefox manually using a .Mar file to be of use.