The icon toolkit/themes/shared/media/audio.svg, which looks like a speaker with sound radiating, is used in video controls and to indicate that a tab is playing audio. e.g. https://philips.s3.eu-central-1.amazonaws.com/Rudolf/VfE_html5.mp4. With pref "media.setsinkid.enabled" set to true, the same is also used in prompts for `selectAudioOutput()`, in the same way as images of a microphone or camera are used in prompts for `getUserMedia()`. e.g. https://bugzilla.mozilla.org/attachment.cgi?id=9303828 The microphone and camera icons, browser/themes/shared/notification-icons/microphone.svg and browser/themes/shared/notification-icons/camera.svg, are rendered as outlines, but the speaker in audio.svg is filled. For consistency, perhaps the speaker also should be rendered as an outline, or perhaps a distinct outline speaker icon should be used with `selectAudioOutput()` prompts.
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The icon toolkit/themes/shared/media/audio.svg, which looks like a speaker with sound radiating, is used in video controls and to indicate that a tab is playing audio. e.g. https://philips.s3.eu-central-1.amazonaws.com/Rudolf/VfE_html5.mp4. With pref "media.setsinkid.enabled" set to true, the same icon is also used in prompts for `selectAudioOutput()`, in the same way as images of a microphone or camera are used in prompts for `getUserMedia()`. e.g. https://bugzilla.mozilla.org/attachment.cgi?id=9303828 The microphone and camera icons, browser/themes/shared/notification-icons/microphone.svg and browser/themes/shared/notification-icons/camera.svg, are rendered as outlines, but the speaker in audio.svg is filled. For consistency, perhaps the speaker also should be rendered as an outline, or perhaps a distinct outline speaker icon should be used with `selectAudioOutput()` prompts.