Tab Sidebar 2.0.1 for Firefox is an add-on that's been around for a while (and, despite other sites claiming that someone would develop a similar feature for Firefox, this was last updated in Summer 2008!) and enables you to add a visual preview of each tab, rather than use the traditional tabbed system. It takes some getting used to. Switching between open tabs, using the visual system, is perhaps more ingenious, but maybe less productive.
Tab Sidebar link.
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