When I am online, several times a day it will not open a new tab and pop up a screen that tells me I have too many tabs open and gives me the option to let it close them or I can close them. But I may only have 1 tab open, sometimes more than that but it doesn't seem to matter how many. I can shut down my computer and bring it back up and it will work ok for a little while and then all of a sudden when I go to open a new tab it does it all over again. I am using mozilla and vista.