Hey @oarfish! Welcome to the Spotify Community. ^^
Are you still experiencing this problem?
If yes, be sure to check if there is an update available for your Firefox browser. If that still doens't help, try to clear your browser cache/cookies to see if that helps. ^^
Peace
Hey there you, Yeah, you! 😁 Welcome - we're glad you joined the Spotify Community! While you here, let's have a fun game…