"Let's say that a week ago, I sent you an email asking you for lunch, and that you answered my email saying that you'd love to take me to your favorite restaurant next to the Eiffel tower," Mozilla's Anne-Marie Bourcier explained in a on Tuesday.

"Yesterday, while we were connected on Facebook chat, you confirmed that you booked a table for 12:30," Bourcier wrote. "This morning, I simply typed Eiffel in Thunderbird search box, and both the email and Facebook chat threads appear instantly, showing the address exchanged over email on one side and the time we will meet on Facebook chat on the other side."

Supported Chat networks include Facebook, Gtalk, IRC, Twitter, and any XMPP network.

2. Do Not Track

While Firefox has long included support, Web search capabilities were only recently added to Thunderbird.