I never expected to open this and find something that would put a big grin on my face.

Thank you for giving me some joy.

I’ve started seeing more black DSMBs recently. They’re meant to be very visible, but every skipper I’ve spoken to disagrees.

When I’m doing project diving, we’ll use a pink DSMB to mark something that we want to go back to, and not surface with it.

Orange for surfacing and yellow for an emergency, as you describe.

It does. Set browser.ssb.enabled to true in about:config.