Tor Browser may leaks something

I use proxychans to torify Firefox 25 so I can see where the browser connect to, when I click the search box the Firefox connects the IP address of the search engine website, so the website will know how fast you type if you type the keywords and hit enter, does the Tor Browser (modified by Firefox) which is similar to Firefox does the same?

I believe search suggestions are turned off by default in Tor browser. If not, you can access the option to turn them off manually be clicking the down arrow in the search box and selecting Manage search engines.

Yes the default Tor Browser has no connection showing in the Tor Network Map when you click the search bar but FireFox 26 (Torify) dosen't, seems it is a bug