If you are using Google Chrome as your default web browser on your Android Lollipop device, you will notice that browser tabs are now displayed along with your apps in the Recent Apps menu (multitasking pane). Android Lollipop opens a card for each of your opened tabs, which can be quite annoying especially when you need to deal with dozen of browser tabs in addition to your opened apps. This tutorial how to unmerge apps and tabs on Android.
Open the Google Chrome app, tap on the Menu button displayed at the top right corner and go to Settings:
Go to Basics and tap on Merge tabs and apps:
Toggle Merge tabs and apps off and tap on OK to move the tabs to the built-in tab switcher of Google Chrome: