By default Firefox only displays the thumbnail preview of the currently open tab in taskbar, with a little trick you can make firefox to display the thumbnail preview of all the tabs that are open in all the windows of Firefox. This comes in handy when you are a regular surfer.
How to enable Preview Thumbnail of all tabs in Firefox
Type about:config in Firefox URL tab, this is the configuration page of Firefox browser.
Initially you will be displayed a warning message, Click on I’ll be careful, I Promise button to open the configuration page.
firefox warning How to Preview all tabs of Firefox in Taskbar
Firefox Warning
In the filter box, enter the word preview. This will shortlist all the configuration based on the keyword.
Double Click on the setting browser.taskbar.previews.enable to set it to true.
firefox thumbnail How to Preview all tabs of Firefox in Taskbar
Firefox Thumbnail Previewq
No Restart is required. You can simply mouse hover on the Firefox button in taskbar and it will display the thumbnail of all the tabs open in Firefox.
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