Ubuntu 13.10, FF 28.0. Did some more testing. Problem indeed starts when you press ALT en type something. Due to my huge bookmark collection hud-service takes 1.3 GB and unity-panel-service 900MB (FF 800MB after start) and for some reason it stalls FF eventhough CPU usage is only 3%. After ending the services FF becomes responsive again.
Ubuntu 13.10, FF 28.0. Did some more testing. Problem indeed starts when you press ALT en type something. Due to my huge bookmark collection hud-service takes 1.3 GB and unity-panel-service 900MB (FF 800MB after start) and for some reason it stalls FF eventhough CPU usage is only 3%. After ending the services FF becomes responsive again.