Please use English.
There is a bug in IPv6 for DNS:
https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/417757
Try the following:
go to about:config
find network.dns.disableIPv6
if it says false, right click and select toggle to change it to true
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Mozilla Firefox Carga las páginas muy lenta
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/36771506/Dependencies.txt
** Attachment added: "ExtensionSummary.txt"
http://launchpadlibrarian.net/36771507/ExtensionSummary.txt
** Attachment added: "profile_default_pluginreg.dat.txt"
http://launchpadlibrarian.net/
