This shows contents of all of tabs as a thumbnail-style list. This requires Deer Park Alpha or later (builds include HTML canvas support).
Released version includes following language packs:
You can show thumbnails of tabs, by "F8" key or both click (both left and right buttons are clicked together). And, "Thumbnail View" button is available for the toolbar. When you point the button (on mouseover), the list of thumbnails is shwon. If you don't need this behavior, you may disable it from the option.
Multiple Tab Handler provides more features for selected thumbnails.
When "Ctrl-Tab", "Shift-Ctrl-Tab", or other shortcuts to switch the tab focus are used, this extension overrides the default behavior and shows the thumbnail list. The "Scroll Wheel Navigation" feature of All-In-One Gesutures also. If you don't need this behavior, you can disable them. This includes a feature to rearrange thumbnails by "most recently viewed".
BTW, Ver.1.4 or later can browser in thumbnails. (This implementation is based on codes from Tab Scope.)