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Screensharing dabbles into Firefox, but doesn't offer any instructions for it, even though it's properly supported by the browser

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You can use these constraints in firefox:

var mediaConstraints = { video: { mozMediaSource: "screen", mediaSource: "screen" } };

Alternatively, replace "screen" with "window" to share an individual window. (Unfortunately there is no single constraint that will allow the user to choose either window or screen, as there is on Chrome).

And you have to set a value in about:config to whitelist your domain. Or has that changed?

That changed a few months ago...no need to change any values or whitelist anything now. However, the UI does default to "no screen", so the user has to specifically choose "entire screen" from the drop-down list.

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