Firefox used to show image previews of my windows when I hover on the taskbar. Checking 'Show tab previews in the Windows taskbar' does not fix it.
[Locked as a duplicate of https://support.mozilla.org/en-US/questions/1253168. Please follow up there, thanks.]
Firefox used to show image previews of my windows when I hover on the taskbar. Checking 'Show tab previews in the Windows taskbar' does not fix it. Why did this stop working after an update?
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That sounds like a Windows O/S issue the taskbar is control by the O/S itself not the Browser.