When you hover over an app’s taskbar button in Windows 10, you’ll see a small thumbnail of each app’s windows. With Firefox, you’ll only see the active tab in each window by default. But with a small change, you can see thumbnail previews of every open tab in every Firefox window.
First, open Firefox. In any window, click the menu button in the top-right corner of the Firefox window (which looks like three horizontal lines) and select “Options.”
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