Allow for Audio Sharing on screensharing

[Galaxy_eyes]

This is a gripe I've had for a while- I do dungeons and dragons through discord, and the music bot I've used has stopped working. All the other ones I could find that were any good you needed to vote for or subscribe to a premium plan and I'm not about that. Allowing to share audio along with your screen through Firefox just seems like a quality of life feature that will be a minor improvement, but still an improvement.

[Jon]

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