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I want to inspect Firefox search bar popup window with Inspector by using Ctrl+Alt+Shift+I keys. But looks like impossible due to focus lost event. Is there some other method?

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The focus issue has an official workaround:

It's hard to debug popups, because the browser hides them as soon as you click outside them. There is a way to disable this behavior. Click the toolbox menu and select Disable popup auto-hide.

dropdown to disable popup hiding

Also note that:

This change is not persistent across browser restarts. When you close the browser toolbox, the setting will be cleared.

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    Also in about:config there is a method ui.popup.disable_autohide. – Ernestas Gruodis Jul 29 '19 at 11:27

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