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Just fine here with Firefox 16.01 Rated 5 out of 5 stars
After having installed protocol 'Microsoft TCP/IP Version 6' from within XP-SP3, even though I remain at this time IPv4 restricted, SixOrNot allows me to discover when a website is "IPv6 ready". Not to mention "information about all the domains contacted in order to load the page" (which is my first motivation). Nice.This review is for a previous version of the add-on (0.7.3.1-signed).