Firefox Devs Working on Tab Preview Feature - OMG! Ubuntu
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Tab previews are in the works for a future release of Mozilla Firefox. In current versions of Firefox you hover your mouse over a non-active tab (i.e. any
    • Vincent@feddit.nl
      0·
      1 year ago

      From the article:

      To control how fast/slow tooltips appear modify browser.tabs.cardPreview.delayMs. This is set to 1000 (milliseconds) by default, meaning tooltips only appear once you’ve hovered over a tab for at least a second.