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strange input field keeps popping up in Firefox

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Hello!

Every so often I accidentally trigger what looks like an input field of some kind.

I have managed to reproduce this ( WinKey + / ) but still have no idea what it is.

Can anyone tell me what this is, or what it's used for? I've attached a couple of image files; one of them is a closeup.

Perhaps it's an add-on that's doing this...

Thanks and have a great day!

Hello! Every so often I accidentally trigger what looks like an input field of some kind. I have managed to reproduce this ( WinKey + / ) but still have no idea what it is. Can anyone tell me what this is, or what it's used for? I've attached a couple of image files; one of them is a closeup. Perhaps it's an add-on that's doing this... Thanks and have a great day!
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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
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thank you cor-el ... I'll try these things out and let you know how it goes... have a great day!