Mozilla Plans to roll out Firefox 4


Just after releasing Firefox 3.5, Mozilla is planning for the next version- Firefox 4. Mozilla Wiki showed two mockups for Firefox 4: Tabs-on-bottom and Tabs-on-top. The screenshots are shown below:

Tab on Bottom

Tab on Top

Mozilla Wiki stated some positves and negatives of Tab on Top:


  • Save Vertical Space
  • Efficiency/Remove Visual Complexity – Right now the tabs have to be connected to something. So we are adding an extra visual element for them to connect to.
  • Shorter Mouse Distance to Page Controls


  • Breaks Consistency/Familiarity – Moving things confuses existing users.
  • Title is MIA – With the space removed from the titlebar you only get the truncated version in the tab.
  • Longer Mouse Distance to Tabs – Takes longer to mouse to a tab.
  • Lost Space – Sandwiched in between the application icon and the window widgets you lose some space


In our opinion, Tab-On-Top is a great design, which is very well used by google chrome. It is more content oriented too.

Give your feedback to Firefox developers on the Firefox 4 Mockups discussion page.

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