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IPV6 Support Slows Opera and Firefox

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http://www.linuxquestions.org – Support for ipv6 keeps being put into the kernel and now into browsers. I blacklisted ipv6 in Slackware and that solved the slow internet response until I updated to the latest Opera and Firefox browsers. Both were horribly slow again. Firefox could be reconfigured to kill ipv6 by running about:config as a url and disabling ipv6. The new Opera 11 is different. I can't find any config to disable ipv6. Does anyone have an idea? I reverted to Opera 10.11 in order to have zippy internet access again, and not "dialup modem" speeds. (HowTos)