If I do the following in Firefox:
then Pandora interprets my space as pressing "Thumbs Down" on the second song! I expected space to pause, like in most music apps and like Pandora does if I haven't recently clicked any thumbs.
I'm using Pandora (web) in Firefox 89.0b9 on macOS 11.3.1
This is probably related to the thumbs down button having focus (invisibly) after being clicked. But somehow that's only a problem in Firefox. If I use Chrome instead, spacebar only pauses (and focused thumbs buttons only react to pressing Enter).
mod edit: changed title for clarity