New on https://t.co/zDdcbPvEwm: entire Tweet conversations pop out with a single click––no more losing your place! pic.twitter.com/RJq8dZIMKh — Twitter Support (@Support) February 2, 2016

After you're done catching up with the conversation, just click on the "x" or background to get back to your timeline.

The social network also announced that it was rolling out instant access to the Twitter timeline on mobile devices for folks without an account to 23 countries. Previously, you could see a the individual tweet that got you to the service, but getting to the timeline or conversation that lead to that status update was difficult.