Fwiw, I've used OmniWeb (MacOSX only) for years and they've had thumbnailed sidetabs for a looooong time. The tabs display in a scrollable drawer. I found an

Fwiw, I've used OmniWeb (MacOSX only) for years and they've had thumbnailed sidetabs for a looooong time. The tabs display in a scrollable drawer. I found an inferior sidetab plugin for Firefox when I was on Linux for a while and have found no comparable thing for IE (I don't use Chrome); I feel vaguely lost with top-tabs because they're too squished, can't be read, and are hard to scroll around. ;P