Firfox stops responding while logging into my Santander Account or Ebay Account. Have to log off my side and log back on to get Sirefox to run again

This does not occur every time. I am running windows 7 64 bit. I input my security details and press enter. The screen flashes and on the top bar it states Not Respondiing. I have left it for hours and it never clears. I have to close down Firefox and log my self off the comoputer and log my self back on to get Firefox to work. If you try to restart Firfox without logging off it will not open. This has been happening since before the last Firefox update.

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