How can I get a color from a hex string on web page? By selecting it, for example

This is a web page with documentation. It explains color option of charts.

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I want to know the visual value of a hex string. How may I get it? ColorZilla is no good here with its eyedropper.

The best option would be to select it and select ‘Show color’ in chrome menu on mouse right button click.

OS is Ubuntu, unfortunately, options may be restricted, I guess.