TabBack for Safari alternatives

Floaty lets you watch YouTube videos while you work, it will hover above all your other windows. You can also view recent urls you played, minimize floaty, and resize easily. Be more productive without switching over tabs in a browser!

Anori is a browser extension that replaces the usual new tab page and enables users to construct their own page using the widgets provided (bookmarks, to do, notes, recently closed pages, top sites, and more) and 8 built-in color schemes.

Boomerang is a simple, lightweight and fast extension that allows you to switch between your previous and current tab at the speed of thought. Simply press Command + Shift + Left Arrow Key and you are back to your previous tab in seconds! (Note: use the Control key on Windows instead of Command).