Recent Firefox versions have an option to display thumbnails for all open tabs when the user clicks on a button in the Firefox tabbar. A comparable option is not available in the Google Chrome web browser by default but the Chrome extension Tabs Plus changes that.
Tabs Plus adds a variety of features to the Chrome browser with thumbnail previews of open tabs being only one of them. The tab preview feature is available by clicking on the icon of the extension in the Chrome address bar after installation.
It seems that the preview thumbnails only work on http site and not https sites.

The thumbnail preview window of all open tabs can also be launched with the keyboard. Windows users press Alt T, Mac users Ctr Shift T and Linux users Shit Alt T to display the window.
A click on any website thumbnail will make that tab the active tab in the web browser. Users with many open tabs can make use of the search to find the tab that they are looking for. The search will not only find the search phrase in the website’s title or url but also in the contents.
Additional options are then provided in that window including a grouping option to group all search result tabs next to each other. It is furthermore possible to bookmark the selected tabs or to open them all in a new browser window.
Tabs Plus is an interesting extension for the Google Chrome web browser that is especially useful for users who like to open many tabs i the browser.
The extension can be downloaded from the Google Chrome extension gallery.
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with everything going wide-screen and with so many using netbooks and small notebooks i don’t get why all browsers don’t have a built-in option for the features found in firefox extensions verttabbar, faviconize tab, and autohide tabbar. chrome especially has so much top-of-the-browser wasted real estate.
http://grab.by/3bQ6
https://chrome.google.com/extensions/detail/ioigddmjfpphkbamgbaolfkpifddnaje