When you hover over an HTML element in the Firefox inspector in colors, this element is the complement of the element and this element marker in the viewport. It is very comfortable.
For example:

As soon as you stop hovering over this element in the inspector, the coloring will disappear.
How do you “snap” this color so that you can brush off the element in the inspector and still have color?
This would be very useful, for example, when scrolling through the viewport, adjusting the page zoom level, quickly viewing one of the inspector's other tabs, etc.
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