Mozilla has implemented a very nice, useful and pleasant looking feature in Firefox 4 called the ‘All tabs preview’. Although it looks more like the task-bar preview, albeit on top, it’s slightly more handy and according to what I feel, ergonomically better. In order, to enable the ‘All tabs preview’ in Firefox 4, this is what you need to do:

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1) In the address-bar, type ‘about:config’ and press enter. Bypass the security by clicking the ‘I’ll be careful, I promise’ button.

2) In the ‘Filter’ box, type ‘browser.allTabs.previews’. Double-click its entry to change its value to ‘true’.

3) Close the configuration tab. Now you will notice the small ‘All tabs’ icon the extreme right in the tool-bar. Click it.

4) Once you click the ‘All Tabs’ button, all the tabs will get listed just below the toolbar in a considerably large thumbnail previews.

The only thing I find missing in the All Tabs Preview is the real-time updating of the thumbnails. It would really add a lot to its functionality. However, this is just the Beta so you never know what’s in store for us in the stable version of Firefox 4.