I run Firefox 29.0-5.fc19 on a fully updated Fedora 19 OS with the KDE Plasma desktop. When I want to listen to the BBC iplayer radio service, I open firefox and go to the site http://www.bbc.co.uk/radio4 and click on 'Listen Live' and a pop-out player spawns and begins playing. If I don't want to browse anything else, I close the main firefox browser leaving the pop-out (child) firefox window playing the live BBC radio stream. But, if I then close this pop-out, I then find I cannot re-start Firefox because error message says firefox is already running. To restart the browser, I have to use ksysguard to kill the running firefox process - usually around 120,000K in size - first. I this a known bug? The only solution seems to be to run another firefox main window before closing the iplayer pop-out player, and then close the main firefox. It's an issue because I don't always remember to go through this rather arcane way of doing things.