I've tested this extension and for some times now and while it's being really great and responsive, something doesn't really work correctly on the Firefox extension only.

I have tested the AudD extension on both Firefox and Chrome, and it appears that the Firefox extension has an issue at the end of song identification.

In Chrome, when initiating a song search, there is an audible cut (similar to a pop) when the extension begins listening, and another when it either identifies the song or fails to do so, which is expected behavior.

However, in Firefox, the initial cut is heard when starting a song search, but not when it ends; the issue arises when any subsequent song is played in the same tab, producing the cut/pop at the beginning of each song, as if the extension continues to listen even when inactive.

The only solution seems to be refreshing the tab after using AudD to prevent the cut/pop from occurring when a new sound plays from the same tab.