One common reason for having a slow network under Firefox with a Fedora distribution is related to iptables. Many proposed solution can be found on the web and suggest to deactivate the Ipv6 option in Firefox. This is done by typing
as a web site name. Just click on the link Accept the risk, I’ll be careful.. In the filter tab, type ipv6. Switch it to true. Restart Firefox (not sure it is required to be effective).
Although this solution works on older version of Fedora (for instance 13), it was unsuccessful under Fedora 14. Today, I’ve noticed a few error messages during the boot time that are related to the file modprobe.conf. For instance:
ip6tables: Applying firewall rules: WARNING: Deprecated config file /etc/modprobe.conf, ...
After a few searches on the web, especially the forums.fedoraforum.org/ website, it seems that indeed this file is deprecated. I decided to remove it (actually, just to be sure not to lose any information, I renamed it):
sudo mv /etc/modprobe.conf /etc/modprobe.conf.old
I rebooted. And guess it. Yes, the network is now as fast as it should be.
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