I question this recently because as I was using the Tor Browser, while in the same time my Google-Chrome was opened, and I right-clicked on a word to search it in 'Disconect', when the page loaded I get message from the AntiScript plugin which really freaked me out:
NoScript filtered a potential cross-site scripting (XSS) attempt from [:chrome]. Technical details have been logged to the Console.
I'm using OpenSuse Tumbleweed (latest version) and I have no firewall, proxy, or VPN stuff.