I have a 4GB Windows 7 machine with over 500 tabs in Firefox and it still runs Office, IE11 and various other stuff without any problems. Mind you, Firefox only

I have a 4GB Windows 7 machine with over 500 tabs in Firefox and it still runs Office, IE11 and various other stuff without any problems. Mind you, Firefox only loads tabs when you click on them, so only about 30-50 are actually "live"....