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Weird graphics bug when hovering over tabs

  • 1 reply
  • 1 has this problem
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  • Last reply by cor-el

wiktoria.nordqvist
wiktoria.nordqvist
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Recently I've been experiencing a weird bug when hovering over tabs (see attached screenshot). This started not too long ago, maybe a month or so. It happens randomly and disappears if I relaunch Firefox. Initially I thought that this only occurred when my computer is connected to an external display, I'm using an old MacBook Pro with an integrated Intel graphics chip. So I figured maybe it was struggling with the resolution of my external monitor. But now it happened without it being connected to the monitor. Has someone experienced this?

Recently I've been experiencing a weird bug when hovering over tabs (see attached screenshot). This started not too long ago, maybe a month or so. It happens randomly and disappears if I relaunch Firefox. Initially I thought that this only occurred when my computer is connected to an external display, I'm using an old MacBook Pro with an integrated Intel graphics chip. So I figured maybe it was struggling with the resolution of my external monitor. But now it happened without it being connected to the monitor. Has someone experienced this?
Attached screenshots

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
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Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or userChrome.css is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Safe Mode start window

For more info about userChrome.css, see: