The best browser out there just became better.
Versions 22.214.171.124 for the Firefox 2 branch and 126.96.36.199 for the Firefox 1.5 branch are out. Update now!
And some news floating around says that 188.8.131.52 and 184.108.40.206 won’t be long either.
You may find a way to update Firefox manually using a .Mar file to be of use.