Pufferfish is a browser built on Firefox. It drops the row of tabs at the top and gives you a dock of live page previews instead, so the page gets more of your screen.
Puff Dock
Move your mouse to the small handle under the address bar and the Puff Dock slides out with a thumbnail of every tab. The one under your pointer puffs up larger. Click to switch, middle-click to close, or press + for a new tab.
Full-screen Puff Dock
When you have too many tabs for the dock, open the full-screen view from the grid button at the end of the Puff Dock, the toolbar, or Ctrl+Shift+A. Every tab is laid out in a grid. Type a few letters to filter, then press Enter to switch. If nothing matches, Enter searches the web instead.
More room
With the tab row gone, the page starts right under the address bar. The Puff Dock only appears when you ask for it, so you get more of the page than in a typical browser, not less.
The same Gecko engine and add-ons you already use, with sponsored address bar suggestions turned off.
Pufferfish is in early development. The Windows installer is on its way.
Windows installer coming soon