Here are some keyboard shortcuts for Firefox and Windows OS.Close Tab (close Window if only one tab) forCtrl + W Ctrl + F4 Middle-click on Tab, Undo Close Tab-Ctrl + Shift + T,Copy Tab - Ctrl + Drag, Next Tab - Ctrl + Tab Ctrl + Page Down, Browsing History (toggle)– CTRL + H. There are many more shortcuts and you can learn all of them from the Firefox Customer Support team. You can also get the list on the internet. If you have any problem in understanding a call to Firefox customer care team will help you to resolve the problem.