Windows Operating System attempting to connect to the Internet

“Windows Operating System” (which I am aware that it is just a placeholder) tried today to connect to (which belongs to
I am actually using the wot Firefox addon and also had firefox opened at the moment when I got this alert. The only thing I find puzzling is that until now this has never happened and I have been using this addon for years, also I find it a little strange that I get this alert at all as addons usually connect through the firefox process itself so I’m still a bit worried/concerned as I’m not entirely sure what to make of this as I never had any alert of this kind before. Is this something I should be worried about or is this something completely harmless/normal?

Please see:;msg763477#msg763477