The best browser out there just became better.
Versions 126.96.36.199 for the Firefox 2 branch and 188.8.131.52 for the Firefox 1.5 branch are out. Update now!
And some news floating around says that 184.108.40.206 and 220.127.116.11 won’t be long either.
You may find a way to update Firefox manually using a .Mar file to be of use.