Recently when pressing Alt + Z in Firefox an element picker show up. If I click on it the element is temporarily hidden, until the page is reloaded:

This has never happened to me before. This new feature isn't listed in the Release Note for Firefox 54 or its sister page for web developer. It is different to the element picker from uBlock Origin addon:

What is this, and how to disable it?


It's from uBlock Origin. Fixed in 1.13.4, see Release notes.

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