Floating Popup Web Browser – convenient and multi-tasking app for Android devices from developer digitalPorta that allows you to view the web page in the pop-up window and simultaneously interact with them. BUT only in this browser is that it can not play videos on YouTube because of the HTML5, use YouTube Floating PopUp Player
Features:

• Support for multiple Windows, click on the application icon to invoke a new window
• Support multi-touch to resize
• Allows you to hide, minimize and maximize the window.
• Open links from a standard browser
• works great on smartphones with large screens (Glaxy S3, Note, Note II) especially tablets
• True multitasking
• Windows seamlessly from landscape to portrait orientation mode
• address Bar and navigation in web pages
• No need root or custom firmware
• lightweight app, about 0.5 MB
• Minimize all Windows with a button "Menu" on device
• Floating window browser starts faster than normal browser