My system recently slowed considerably. When I checked what was happening, I found there were up to 14 Firefox 'windows' showing in my Task Manager, and collectively these 'windows' were consuming over 25% of the computer memory (650+MB) even with Firefox just opened as the initial browser screen; no addresses etc had yet to be added. I've followed many of the troubleshooting suggestions, but to no avail. I have not reset the browser as yet as I need to understand the root of the problem

Thanks in advance for your assistance Duncan Hodder