Version 5.3 introduced several heavy-hitting features that define the experience in version 5.3.9: SoundSource Release Notes - Rogue Amoeba
: Corrected an issue where Firefox audio was appearing twice in the source list. SoundSource 5.3.9
: Clicking the menu bar icon now reveals the main SoundSource window even if it was previously pinned, rather than forcing it back to the menu bar. Version 5