Side Panel

A side-panel which can have nested tabbed panels (like Foobar2000!)

Memory Management, for God's Sake!

• Free up old tabs

• Cache "back"s (incredibly common usage pattern: click link, look at it for 20 seconds, click back.)

Desktop Integration

• Global hotkeys
• Desktop widgets
• Custom tray-notifications (eg: intelligent event queueing, with ability to replace visible item immediately)

Task Manager

Dynamic unloading/reloading of tabs

Set an elastic ceiling on how much memory your tabs can use at once.

• When will this cause thrashing? What would the user have to do?

Tree view

* Work [Window]

• A [Group]
  • [Tab]
    • [Tab]
    • [Tab]
    • [Tab]
  • [Tab]
    • [Tab]
  • [Tab]
    • [Tab]
  • [Tab]
    • [Tab]
• B [Group]
  • [Tab]
    • [Tab]
    • [Tab]
      • [Tab]
    • [Tab]
  • [Tab]
    • [Tab]
      • [Tab]
        • [Tab]
  • [Tab]
  • [Tab]
  • [Tab]

* Work [Window]

• A [Group]
  • [Tab]
  • [Tab]
  • [Tab]
  • [Tab]
• B [Group]
  • [Tab]
    • [Tab]
    • [Tab]
  • [Tab]
  • [Tab]
  • [Tab]
  • [Tab]

Fresh Start Session Saver

An EXPANDO Button. Clicking it will:

• expand the sessions view to fill up half (or more) of the browser window
• add a new column (bottom pane, right column) that shows the contents of the currently selected session
• sessions can be trees (to go with the new task manager)

Big Link-Hover-Statusbar

The tiny bar at the bottom that pops up when you hover a link is really cool, because it slides around when you move your mouse over it. However, it's too small to ever need to be moved. It's also harder to read peripherally because it's so small. I think making it bigger would be nice.

Visual Configuration Screen

It's a pain to customize a browser by going to the options, reading text descriptions of features, checking them off, closing the options, remembering what you changed and trying to test it so that you can see if it's a good idea or not, and occasionally being dissatisfied with the feature, and having to go back into the options, find the option again, and deactivate.

What a pain!

How about hijacking the entire display, and rendering a screen overlay on top of the browser UI with highlighted features and little description bubbles coming off them. Each bubble could let you pick a customization and display it working immediately, for extra feedback.

Momentum-based Middle-Click Scrolling

Copy Opera's autoscroll exactly.