I too am experiencing this. I use Ubuntu Dapper 6.06 LTS x86_64, kernel 2.6.15.26
Firefox update 1.5.dfsg+1.5.0.10-0ubuntu0.6.06.1 apparently broke many sites (e.g. amazon.com personal account maintenance; launchpad.net) due to above problem with PSM. Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.7.12) Gecko/20060216 Debian/1.7.12-1.1ubuntu2 allowed me to access this site. -- Update of Firefox disables PSM (not more SSL or saved passwords) https://launchpad.net/bugs/89023 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs