$sudo apt-get install iceweasel

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  libmozjs2d xulrunner-1.9.1
Suggested packages:
  ttf-lyx latex-xft-fonts xfonts-mathml ttf-mathematica4.1 xprint mozplugger
The following NEW packages will be installed:
  iceweasel libmozjs2d xulrunner-1.9.1
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 8792kB of archives.
After this operation, 24.5MB of additional disk space will be used.
Do you want to continue [Y/n]? Y
Err http://debian.org.ua squeeze/main libmozjs2d 1.9.1.8-5
  404  Not Found
Err http://debian.org.ua squeeze/main xulrunner-1.9.1 1.9.1.8-5
  404  Not Found
Err http://debian.org.ua squeeze/main iceweasel 3.5.8-1
  404  Not Found
Failed to fetch http://debian.org.ua/debian/pool/main/x/xulrunner/libmozjs2d_1.9.1.8-5_i386.deb  404  Not Found
Failed to fetch http://debian.org.ua/debian/pool/main/x/xulrunner/xulrunner-1.9.1_1.9.1.8-5_i386.deb  404  Not Found
Failed to fetch http://debian.org.ua/debian/pool/main/i/iceweasel/iceweasel_3.5.8-1_i386.deb  404  Not Found
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?