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Lose focus on some websites when pressing the Control key

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  • Last reply by cor-el

nnadisic
nnadisic
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I am using Firefox 127 on Ubuntu.

When I press the Control key, I often lose focus in the window I am currently viewing. This is annoying as it prevents me from copy-pasting for example.

Sometimes the focus is back when I release Control, sometimes it is lost and I have to click again on the text field. It does not happen on all websites, for example support.mozilla.org works well, but it happens on duckduckgo or overleaf.

It does not seem to be the same as existing issues such as [the "show mouse when press Ctrl" of Ubuntu] (it is disabled) or an addon (the problem still happens in safe mode).

In case it is useful, when I press Control the tab bar background goes slightly darker, see attached images.

Thanks for your help :) Nicolas

I am using Firefox 127 on Ubuntu. When I press the Control key, I often lose focus in the window I am currently viewing. This is annoying as it prevents me from copy-pasting for example. Sometimes the focus is back when I release Control, sometimes it is lost and I have to click again on the text field. It does not happen on all websites, for example support.mozilla.org works well, but it happens on duckduckgo or overleaf. It does not seem to be the same as existing issues such as [[https://support.mozilla.org/en-US/questions/1191486#search the "show mouse when press Ctrl" of Ubuntu]] (it is disabled) or [https://superuser.com/questions/1090673/why-does-the-active-firefox-window-occasionally-lose-focus an addon] (the problem still happens in safe mode). In case it is useful, when I press Control the tab bar background goes slightly darker, see attached images. Thanks for your help :) Nicolas
Capturas de pantalla anexas

cor-el modificouno o

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cor-el
cor-el
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(deleted, sorry wrong thread)

cor-el modificouno o

Helpful?

cor-el
cor-el
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Sorry for my above reply, was meant for another thread.

I assume that this is still caused by a setting in your Ubuntu OS as Firefox doesn't come with such a feature.

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

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

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